What is the general solution for 1+cos(pix)=sin(pix) ?

The general solution for 1+cos(pix)=sin(pix) is x= 1/2+2n,x=1+2n

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1+cos(pix)=sin(pix)

Solution

1 + cos (π x) = sin (π x)

Solution

x = \frac{1}{2} + 2 n, x = 1 + 2 n

Degrees

x = 28.64788 \dots^{\circ} + 114.59155 \dots^{\circ} n, x = 57.29577 \dots^{\circ} + 114.59155 \dots^{\circ} n

Solution steps

1 + cos (π x) = sin (π x)

Subtract

sin (π x)

from both sides

1 + cos (π x) - sin (π x) = 0

Rewrite using trig identities

1 + cos (x π) - sin (x π)

Use the following identity:

sin (x) = cos (\frac{π}{2} - x)

= 1 + cos (x π) - cos (\frac{π}{2} - x π)

Use the Sum to Product identity:

cos (s) - cos (t) = - 2 sin (\frac{s + t}{2}) sin (\frac{s - t}{2})

= 1 - 2 sin (\frac{x π + \frac{π}{2} - x π}{2}) sin (\frac{x π - ( \frac{π}{2} - x π )}{2})

2 sin (\frac{x π + \frac{π}{2} - x π}{2}) sin (\frac{x π - ( \frac{π}{2} - x π )}{2}) = 2 sin (\frac{4 π x - π}{4})

2 sin (\frac{x π + \frac{π}{2} - x π}{2}) sin (\frac{x π - ( \frac{π}{2} - x π )}{2})

\frac{x π + \frac{π}{2} - x π}{2} = \frac{π}{4}

\frac{x π + \frac{π}{2} - x π}{2}

x π + \frac{π}{2} - x π = \frac{π}{2}

x π + \frac{π}{2} - x π

Group like terms

= π x - π x + \frac{π}{2}

Add similar elements:

π x - π x = 0

= \frac{π}{2}

= \frac{\frac{π}{2}}{2}

Apply the fraction rule:

\frac{\frac{b}{c}}{a} = \frac{b}{c \cdot a}

= \frac{π}{2 \cdot 2}

Multiply the numbers:

2 \cdot 2 = 4

= \frac{π}{4}

= 2 sin (\frac{π}{4}) sin (\frac{π x - ( - π x + \frac{π}{2} )}{2})

\frac{x π - ( \frac{π}{2} - x π )}{2} = \frac{4 π x - π}{4}

\frac{x π - ( \frac{π}{2} - x π )}{2}

Expand

x π - (\frac{π}{2} - x π) : 2 π x - \frac{π}{2}

x π - (\frac{π}{2} - x π)

= π x - (\frac{π}{2} - π x)

- (\frac{π}{2} - x π) : - \frac{π}{2} + x π

- (\frac{π}{2} - x π)

Distribute parentheses

= - (\frac{π}{2}) - (- x π)

Apply minus-plus rules

- (- a) = a, - (a) = - a

= - \frac{π}{2} + x π

= x π - \frac{π}{2} + x π

Simplify

x π - \frac{π}{2} + x π : 2 π x - \frac{π}{2}

x π - \frac{π}{2} + x π

Group like terms

= π x + π x - \frac{π}{2}

Add similar elements:

π x + π x = 2 π x

= 2 π x - \frac{π}{2}

= 2 π x - \frac{π}{2}

= \frac{2 π x - \frac{π}{2}}{2}

Join

2 π x - \frac{π}{2} : \frac{4 π x - π}{2}

2 π x - \frac{π}{2}

Convert element to fraction:

2 π x = \frac{2 π x 2}{2}

= \frac{2 π x \cdot 2}{2} - \frac{π}{2}

Since the denominators are equal, combine the fractions:

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

= \frac{2 π x \cdot 2 - π}{2}

Multiply the numbers:

2 \cdot 2 = 4

= \frac{4 π x - π}{2}

= \frac{\frac{4 π x - π}{2}}{2}

Apply the fraction rule:

\frac{\frac{b}{c}}{a} = \frac{b}{c \cdot a}

= \frac{4 π x - π}{2 \cdot 2}

Multiply the numbers:

2 \cdot 2 = 4

= \frac{4 π x - π}{4}

= 2 sin (\frac{π}{4}) sin (\frac{4 π x - π}{4})

Simplify

sin (\frac{π}{4}) : \frac{2}{2}

sin (\frac{π}{4})

Use the following trivial identity:

sin (\frac{π}{4}) = \frac{2}{2}

sin (x)

periodicity table with

2 πn

cycle:

x 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} \frac{2 π}{3} \frac{3 π}{4} \frac{5 π}{6} sin (x) 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} x π \frac{7 π}{6} \frac{5 π}{4} \frac{4 π}{3} \frac{3 π}{2} \frac{5 π}{3} \frac{7 π}{4} \frac{11 π}{6} sin (x) 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2}

= \frac{2}{2}

= 2 \cdot \frac{2}{2} sin (\frac{4 π x - π}{4})

Multiply fractions:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= \frac{2 \cdot 2 sin ( \frac{4 π x - π}{4} )}{2}

Cancel the common factor:

2

= 2 sin (\frac{4 π x - π}{4})

= 1 - 2 sin (\frac{4 π x - π}{4})

1 - 2 sin (\frac{4 π x - π}{4}) = 0

Move

1

to the right side

1 - 2 sin (\frac{4 π x - π}{4}) = 0

Subtract

1

from both sides

1 - 2 sin (\frac{4 π x - π}{4}) - 1 = 0 - 1

Simplify

- 2 sin (\frac{4 π x - π}{4}) = - 1

- 2 sin (\frac{4 π x - π}{4}) = - 1

Divide both sides by

- 2

- 2 sin (\frac{4 π x - π}{4}) = - 1

Divide both sides by

- 2

\frac{- 2 sin ( \frac{4 π x - π}{4} )}{- 2} = \frac{- 1}{- 2}

Simplify

\frac{- 2 sin ( \frac{4 π x - π}{4} )}{- 2} = \frac{- 1}{- 2}

Simplify

\frac{- 2 sin ( \frac{4 π x - π}{4} )}{- 2} : sin (\frac{4 π x - π}{4})

\frac{- 2 sin ( \frac{4 π x - π}{4} )}{- 2}

Apply the fraction rule:

\frac{- a}{- b} = \frac{a}{b}

= \frac{2 sin ( \frac{4 π x - π}{4} )}{2}

Cancel the common factor:

2

= sin (\frac{4 π x - π}{4})

Simplify

\frac{- 1}{- 2} : \frac{2}{2}

\frac{- 1}{- 2}

Apply the fraction rule:

\frac{- a}{- b} = \frac{a}{b}

= \frac{1}{2}

Rationalize

\frac{1}{2} : \frac{2}{2}

\frac{1}{2}

Multiply by the conjugate

\frac{2}{2}

= \frac{1 \cdot 2}{2 2}

1 \cdot 2 = 2

22 = 2

22

Apply radical rule:

a a = a

22 = 2

= 2

= \frac{2}{2}

= \frac{2}{2}

sin (\frac{4 π x - π}{4}) = \frac{2}{2}

sin (\frac{4 π x - π}{4}) = \frac{2}{2}

sin (\frac{4 π x - π}{4}) = \frac{2}{2}

General solutions for

sin (\frac{4 π x - π}{4}) = \frac{2}{2}

sin (x)

periodicity table with

2 πn

cycle:

x 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} \frac{2 π}{3} \frac{3 π}{4} \frac{5 π}{6} sin (x) 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} x π \frac{7 π}{6} \frac{5 π}{4} \frac{4 π}{3} \frac{3 π}{2} \frac{5 π}{3} \frac{7 π}{4} \frac{11 π}{6} sin (x) 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2}

\frac{4 π x - π}{4} = \frac{π}{4} + 2 πn, \frac{4 π x - π}{4} = \frac{3 π}{4} + 2 πn

\frac{4 π x - π}{4} = \frac{π}{4} + 2 πn, \frac{4 π x - π}{4} = \frac{3 π}{4} + 2 πn

Solve

\frac{4 π x - π}{4} = \frac{π}{4} + 2 πn : x = \frac{1}{2} + 2 n

\frac{4 π x - π}{4} = \frac{π}{4} + 2 πn

Multiply both sides by

4

\frac{4 π x - π}{4} = \frac{π}{4} + 2 πn

Multiply both sides by

4

\frac{4 ( 4 π x - π )}{4} = 4 \cdot \frac{π}{4} + 4 \cdot 2 πn

Simplify

\frac{4 ( 4 π x - π )}{4} = 4 \cdot \frac{π}{4} + 4 \cdot 2 πn

Simplify

\frac{4 ( 4 π x - π )}{4} : 4 π x - π

\frac{4 ( 4 π x - π )}{4}

Divide the numbers:

\frac{4}{4} = 1

= 4 π x - π

Simplify

4 \cdot \frac{π}{4} + 4 \cdot 2 πn : π + 8 πn

4 \cdot \frac{π}{4} + 4 \cdot 2 πn

4 \cdot \frac{π}{4} = π

4 \cdot \frac{π}{4}

Multiply fractions:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= \frac{π 4}{4}

Cancel the common factor:

4

= π

4 \cdot 2 πn = 8 πn

4 \cdot 2 πn

Multiply the numbers:

4 \cdot 2 = 8

= 8 πn

= π + 8 πn

4 π x - π = π + 8 πn

4 π x - π = π + 8 πn

4 π x - π = π + 8 πn

Move

π

to the right side

4 π x - π = π + 8 πn

Add

π

to both sides

4 π x - π + π = π + 8 πn + π

Simplify

4 π x = 2 π + 8 πn

4 π x = 2 π + 8 πn

Divide both sides by

4 π

4 π x = 2 π + 8 πn

Divide both sides by

4 π

\frac{4 π x}{4 π} = \frac{2 π}{4 π} + \frac{8 πn}{4 π}

Simplify

\frac{4 π x}{4 π} = \frac{2 π}{4 π} + \frac{8 πn}{4 π}

Simplify

\frac{4 π x}{4 π} : x

\frac{4 π x}{4 π}

Divide the numbers:

\frac{4}{4} = 1

= \frac{π x}{π}

Cancel the common factor:

π

= x

Simplify

\frac{2 π}{4 π} + \frac{8 πn}{4 π} : \frac{1}{2} + 2 n

\frac{2 π}{4 π} + \frac{8 πn}{4 π}

Cancel

\frac{2 π}{4 π} : \frac{1}{2}

\frac{2 π}{4 π}

Cancel

\frac{2 π}{4 π} : \frac{1}{2}

\frac{2 π}{4 π}

Cancel the common factor:

2

= \frac{π}{2 π}

Cancel the common factor:

π

= \frac{1}{2}

= \frac{1}{2}

= \frac{1}{2} + \frac{8 πn}{4 π}

Cancel

\frac{8 πn}{4 π} : 2 n

\frac{8 πn}{4 π}

Cancel

\frac{8 πn}{4 π} : 2 n

\frac{8 πn}{4 π}

Divide the numbers:

\frac{8}{4} = 2

= \frac{2 πn}{π}

Cancel the common factor:

π

= 2 n

= 2 n

= \frac{1}{2} + 2 n

x = \frac{1}{2} + 2 n

x = \frac{1}{2} + 2 n

x = \frac{1}{2} + 2 n

Solve

\frac{4 π x - π}{4} = \frac{3 π}{4} + 2 πn : x = 1 + 2 n

\frac{4 π x - π}{4} = \frac{3 π}{4} + 2 πn

Multiply both sides by

4

\frac{4 π x - π}{4} = \frac{3 π}{4} + 2 πn

Multiply both sides by

4

\frac{4 ( 4 π x - π )}{4} = 4 \cdot \frac{3 π}{4} + 4 \cdot 2 πn

Simplify

\frac{4 ( 4 π x - π )}{4} = 4 \cdot \frac{3 π}{4} + 4 \cdot 2 πn

Simplify

\frac{4 ( 4 π x - π )}{4} : 4 π x - π

\frac{4 ( 4 π x - π )}{4}

Divide the numbers:

\frac{4}{4} = 1

= 4 π x - π

Simplify

4 \cdot \frac{3 π}{4} + 4 \cdot 2 πn : 3 π + 8 πn

4 \cdot \frac{3 π}{4} + 4 \cdot 2 πn

4 \cdot \frac{3 π}{4} = 3 π

4 \cdot \frac{3 π}{4}

Multiply fractions:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= \frac{3 π 4}{4}

Cancel the common factor:

4

= 3 π

4 \cdot 2 πn = 8 πn

4 \cdot 2 πn

Multiply the numbers:

4 \cdot 2 = 8

= 8 πn

= 3 π + 8 πn

4 π x - π = 3 π + 8 πn

4 π x - π = 3 π + 8 πn

4 π x - π = 3 π + 8 πn

Move

π

to the right side

4 π x - π = 3 π + 8 πn

Add

π

to both sides

4 π x - π + π = 3 π + 8 πn + π

Simplify

4 π x = 4 π + 8 πn

4 π x = 4 π + 8 πn

Divide both sides by

4 π

4 π x = 4 π + 8 πn

Divide both sides by

4 π

\frac{4 π x}{4 π} = \frac{4 π}{4 π} + \frac{8 πn}{4 π}

Simplify

\frac{4 π x}{4 π} = \frac{4 π}{4 π} + \frac{8 πn}{4 π}

Simplify

\frac{4 π x}{4 π} : x

\frac{4 π x}{4 π}

Divide the numbers:

\frac{4}{4} = 1

= \frac{π x}{π}

Cancel the common factor:

π

= x

Simplify

\frac{4 π}{4 π} + \frac{8 πn}{4 π} : 1 + 2 n

\frac{4 π}{4 π} + \frac{8 πn}{4 π}

Apply rule

\frac{a}{a} = 1

\frac{4 π}{4 π} = 1

= 1 + \frac{8 πn}{4 π}

Cancel

\frac{8 πn}{4 π} : 2 n

\frac{8 πn}{4 π}

Cancel

\frac{8 πn}{4 π} : 2 n

\frac{8 πn}{4 π}

Divide the numbers:

\frac{8}{4} = 2

= \frac{2 πn}{π}

Cancel the common factor:

π

= 2 n

= 2 n

= 1 + 2 n

x = 1 + 2 n

x = 1 + 2 n

x = 1 + 2 n

x = \frac{1}{2} + 2 n, x = 1 + 2 n

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Frequently Asked Questions (FAQ)

What is the general solution for 1+cos(pix)=sin(pix) ?
The general solution for 1+cos(pix)=sin(pix) is x= 1/2+2n,x=1+2n