How do you solve the equation 5cos(2x)=2 ?

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- Nov 11th 2012, 11:57 AMderek1008Trigonometric Equation
How do you solve the equation 5cos(2x)=2 ?

- Nov 11th 2012, 12:52 PMMarkFLRe: Trigonometric Equation
I would divide through by 5 first. Then I would solve the 2 cases (where ):

a)

b)

Recall, if then , where is an arbitrary constant.