What is the general solution for 2sqrt(2)cos(θ)-2=0 ?

The general solution for 2sqrt(2)cos(θ)-2=0 is θ= pi/4+2pin,θ=(7pi)/4+2pin

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2sqrt(2)cos(θ)-2=0

22 cos (θ) - 2 = 0

θ = \frac{π}{4} + 2 πn, θ = \frac{7 π}{4} + 2 πn

Degrees

θ = 4 5^{\circ} + 36 0^{\circ} n, θ = 31 5^{\circ} + 36 0^{\circ} n

Solution steps

22 cos (θ) - 2 = 0

Move

2

to the right side

22 cos (θ) - 2 = 0

Add

2

to both sides

22 cos (θ) - 2 + 2 = 0 + 2

Simplify

22 cos (θ) = 2

22 cos (θ) = 2

Divide both sides by

22

22 cos (θ) = 2

Divide both sides by

22

\frac{2 2 cos ( θ )}{2 2} = \frac{2}{2 2}

Simplify

\frac{2 2 cos ( θ )}{2 2} = \frac{2}{2 2}

Simplify

\frac{2 2 cos ( θ )}{2 2} : cos (θ)

\frac{2 2 cos ( θ )}{2 2}

Divide the numbers:

\frac{2}{2} = 1

= \frac{2 cos ( θ )}{2}

Cancel the common factor:

2

= cos (θ)

Simplify

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

\frac{2}{2 2}

Divide the numbers:

\frac{2}{2} = 1

= \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}

cos (θ) = \frac{2}{2}

cos (θ) = \frac{2}{2}

cos (θ) = \frac{2}{2}

General solutions for

cos (θ) = \frac{2}{2}

cos (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} cos (x) 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{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} cos (x) - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2} 0 \frac{1}{2} \frac{2}{2} \frac{3}{2}

θ = \frac{π}{4} + 2 πn, θ = \frac{7 π}{4} + 2 πn

θ = \frac{π}{4} + 2 πn, θ = \frac{7 π}{4} + 2 πn

tan (x) = \frac{22}{326}

3 cos (6 x) = 2

2 cos (t) = 1 + sin (t)

cos (θ) = - \frac{5}{6}, csc (θ)

sin^{2} (x) = - 2 + 3 sin (x) + cos^{2} (x)

What is the general solution for 2sqrt(2)cos(θ)-2=0 ?
The general solution for 2sqrt(2)cos(θ)-2=0 is θ= pi/4+2pin,θ=(7pi)/4+2pin