Question

4cos^2(x)-4cosx =2

Answer 1

This might help. c: https://answers.yahoo.com/question/index?qid=20090702105018AAvNaEg

Answer 2

let cos(x) = a

Answer 3

solve the quadratic, with a's (or any other variable you choose for substitution).... and sub the cos(x) for the variable back to solve for x.

Answer 4

\(\large\color{black}{ \displaystyle 4\cos^2x-4\cos x =2 }\)


substitution w=cos(x),

\(\large\color{black}{ \displaystyle 4w^2-4w =2 }\)

Answer 5

Welcome to Openstudy. :D

Answer 6

Please read the CoC(Code-of-Conduct) when you get the chance. Thank you.
http://openstudy.com/code-of-conduct

Answer 7

Thanks

Answer 8

you welcome