What is the general solution for 2cos(x)=-1,0<= x<2pi ?

The general solution for 2cos(x)=-1,0<= x<2pi is x=(2pi)/3 ,x=(4pi)/3

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

2 cos (x) = - 1, 0 \leq x < 2 π

x = \frac{2 π}{3}, x = \frac{4 π}{3}

Degrees

x = 12 0^{\circ}, x = 24 0^{\circ}

Solution steps

2 cos (x) = - 1, 0 \leq x < 2 π

Divide both sides by

2

2 cos (x) = - 1

Divide both sides by

2

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

Simplify

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

Solutions for the range

0 \leq x < 2 π

x = \frac{2 π}{3}, x = \frac{4 π}{3}

cos (θ) = \frac{3}{11}

\frac{30}{sin ( 9 0 ^{\circ} )} = \frac{30}{sin ( x )}, x

\frac{sec ( x )}{cos ( x )} - 1 = 0

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

cos^{2} (x) - 2 cos (x) + 1 = 0, 0^{\circ} 36 0^{\circ}

What is the general solution for 2cos(x)=-1,0<= x<2pi ?
The general solution for 2cos(x)=-1,0<= x<2pi is x=(2pi)/3 ,x=(4pi)/3