What is the general solution for cos(x)=-0.64 ?

The general solution for cos(x)=-0.64 is x=2.26529…+2pin,x=-2.26529…+2pin

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cos(x)=-0.64

cos (x) = - 0.64

x = 2.26529 \dots + 2 πn, x = - 2.26529 \dots + 2 πn

Degrees

x = 129.79181 \dots^{\circ} + 36 0^{\circ} n, x = - 129.79181 \dots^{\circ} + 36 0^{\circ} n

Solution steps

cos (x) = - 0.64

Apply trig inverse properties

cos (x) = - 0.64

General solutions for

cos (x) = - 0.64

cos (x) = - a \Rightarrow x = arccos (- a) + 2 πn, x = - arccos (- a) + 2 πn

x = arccos (- 0.64) + 2 πn, x = - arccos (- 0.64) + 2 πn

x = arccos (- 0.64) + 2 πn, x = - arccos (- 0.64) + 2 πn

Show solutions in decimal form

x = 2.26529 \dots + 2 πn, x = - 2.26529 \dots + 2 πn

y, x = tan (\frac{π}{4} y)

2 sin^{2} (x) - 5 sin (x) + 2 = 0, 0 \leq x \leq 2 π

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

sec (θ) = sin^{2} (θ) sec (θ)

sin (2 θ) + sin (θ) = 0, 0 \leq θ \leq 2 π

What is the general solution for cos(x)=-0.64 ?
The general solution for cos(x)=-0.64 is x=2.26529…+2pin,x=-2.26529…+2pin