What is the general solution for sin(2x)-cos(2x)=1 ?

The general solution for sin(2x)-cos(2x)=1 is x= pi/4+pin,x=pin+pi/2

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sin(2x)-cos(2x)=1

Solution

sin (2 x) - cos (2 x) = 1

Solution

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

Degrees

x = 4 5^{\circ} + 18 0^{\circ} n, x = 9 0^{\circ} + 18 0^{\circ} n

Solution steps

sin (2 x) - cos (2 x) = 1

Rewrite using trig identities

sin (2 x) - cos (2 x)

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

sin (2 x) - cos (2 x)

Rewrite as

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

Use the following trivial identity:

cos (\frac{π}{4}) = \frac{1}{2}

Use the following trivial identity:

sin (\frac{π}{4}) = \frac{1}{2}

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

Use the Angle Sum identity:

sin (s - t) = sin (s) cos (t) - cos (s) sin (t)

= 2 sin (2 x - \frac{π}{4})

= 2 sin (2 x - \frac{π}{4})

2 sin (2 x - \frac{π}{4}) = 1

Divide both sides by

2

2 sin (2 x - \frac{π}{4}) = 1

Divide both sides by

2

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

Simplify

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

Simplify

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

\frac{2 sin ( 2 x - \frac{π}{4} )}{2}

Cancel the common factor:

2

= sin (2 x - \frac{π}{4})

Simplify

\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}

sin (2 x - \frac{π}{4}) = \frac{2}{2}

sin (2 x - \frac{π}{4}) = \frac{2}{2}

sin (2 x - \frac{π}{4}) = \frac{2}{2}

General solutions for

sin (2 x - \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}

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

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

Solve

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

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

Move

\frac{π}{4}

to the right side

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

Add

\frac{π}{4}

to both sides

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

Simplify

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

Simplify

2 x - \frac{π}{4} + \frac{π}{4} : 2 x

2 x - \frac{π}{4} + \frac{π}{4}

Add similar elements:

- \frac{π}{4} + \frac{π}{4} = 0

= 2 x

Simplify

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

\frac{π}{4} + 2 πn + \frac{π}{4}

Group like terms

= \frac{π}{4} + \frac{π}{4} + 2 πn

Combine the fractions

\frac{π}{4} + \frac{π}{4} : \frac{π}{2}

Apply rule

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

= \frac{π + π}{4}

Add similar elements:

π + π = 2 π

= \frac{2 π}{4}

Cancel the common factor:

2

= \frac{π}{2}

= \frac{π}{2} + 2 πn

2 x = \frac{π}{2} + 2 πn

2 x = \frac{π}{2} + 2 πn

2 x = \frac{π}{2} + 2 πn

Divide both sides by

2

2 x = \frac{π}{2} + 2 πn

Divide both sides by

2

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

Simplify

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

Simplify

\frac{2 x}{2} : x

\frac{2 x}{2}

Divide the numbers:

\frac{2}{2} = 1

= x

Simplify

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

\frac{\frac{π}{2}}{2} + \frac{2 πn}{2}

\frac{\frac{π}{2}}{2} = \frac{π}{4}

\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}

\frac{2 πn}{2} = πn

\frac{2 πn}{2}

Divide the numbers:

\frac{2}{2} = 1

= πn

= \frac{π}{4} + πn

x = \frac{π}{4} + πn

x = \frac{π}{4} + πn

x = \frac{π}{4} + πn

Solve

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

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

Move

\frac{π}{4}

to the right side

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

Add

\frac{π}{4}

to both sides

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

Simplify

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

Simplify

2 x - \frac{π}{4} + \frac{π}{4} : 2 x

2 x - \frac{π}{4} + \frac{π}{4}

Add similar elements:

- \frac{π}{4} + \frac{π}{4} = 0

= 2 x

Simplify

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

\frac{3 π}{4} + 2 πn + \frac{π}{4}

Group like terms

= 2 πn + \frac{π}{4} + \frac{3 π}{4}

Combine the fractions

\frac{π}{4} + \frac{3 π}{4} : π

Apply rule

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

= \frac{π + 3 π}{4}

Add similar elements:

π + 3 π = 4 π

= \frac{4 π}{4}

Divide the numbers:

\frac{4}{4} = 1

= π

= 2 πn + π

2 x = 2 πn + π

2 x = 2 πn + π

2 x = 2 πn + π

Divide both sides by

2

2 x = 2 πn + π

Divide both sides by

2

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

Simplify

x = πn + \frac{π}{2}

x = πn + \frac{π}{2}

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

Popular Examples

sin(x+pi/6)+cos(x+pi/6)=1

sin (x + \frac{π}{6}) + cos (x + \frac{π}{6}) = 1

sin(x)=-1,0<= x<= 2pi

sin (x) = - 1, 0 \leq x \leq 2 π

-sqrt(3)sin(x)+cos(x)=0

- 3 sin (x) + cos (x) = 0

2sin^2(x)+5cos(x)-4=0

2 sin^{2} (x) + 5 cos (x) - 4 = 0

cos(2x)=3sin(x)-1

cos (2 x) = 3 sin (x) - 1

Frequently Asked Questions (FAQ)

What is the general solution for sin(2x)-cos(2x)=1 ?
The general solution for sin(2x)-cos(2x)=1 is x= pi/4+pin,x=pin+pi/2