What is the general solution for 4cos(x)-5=-7 ?

The general solution for 4cos(x)-5=-7 is x=(2pi)/3+2pin,x=(4pi)/3+2pin

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4cos(x)-5=-7

4 cos (x) - 5 = - 7

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

Degrees

x = 12 0^{\circ} + 36 0^{\circ} n, x = 24 0^{\circ} + 36 0^{\circ} n

Solution steps

4 cos (x) - 5 = - 7

Move

5

to the right side

4 cos (x) - 5 = - 7

Add

5

to both sides

4 cos (x) - 5 + 5 = - 7 + 5

Simplify

4 cos (x) = - 2

4 cos (x) = - 2

Divide both sides by

4

4 cos (x) = - 2

Divide both sides by

4

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

Simplify

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

Simplify

\frac{4 cos ( x )}{4} : cos (x)

\frac{4 cos ( x )}{4}

Divide the numbers:

\frac{4}{4} = 1

= cos (x)

Simplify

\frac{- 2}{4} : - \frac{1}{2}

\frac{- 2}{4}

Apply the fraction rule:

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

= - \frac{2}{4}

Cancel the common factor:

2

= - \frac{1}{2}

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

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

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

General solutions for

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

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

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

0 = 1 + 2 sin (\frac{x ^{2}}{2})

cos (2 x) - 5 cos (x) + 3 = 0

9 sin^{2} (x) + 18 sin (x) + 9 = 0

- 12 sin^{2} (θ) + 7 = 4

4 cos (θ) + 5 = 0

What is the general solution for 4cos(x)-5=-7 ?
The general solution for 4cos(x)-5=-7 is x=(2pi)/3+2pin,x=(4pi)/3+2pin