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anonymous
 one year ago
4cos^2(x)4cosx =2
anonymous
 one year ago
4cos^2(x)4cosx =2

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Elsa213
 one year ago
Best ResponseYou've already chosen the best response.1This might help. c: https://answers.yahoo.com/question/index?qid=20090702105018AAvNaEg

SolomonZelman
 one year ago
Best ResponseYou've already chosen the best response.2solve 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.

SolomonZelman
 one year ago
Best ResponseYou've already chosen the best response.2\(\large\color{black}{ \displaystyle 4\cos^2x4\cos x =2 }\) substitution w=cos(x), \(\large\color{black}{ \displaystyle 4w^24w =2 }\)

Elsa213
 one year ago
Best ResponseYou've already chosen the best response.1Welcome to Openstudy. :D

Elsa213
 one year ago
Best ResponseYou've already chosen the best response.1Please read the CoC(CodeofConduct) when you get the chance. Thank you. http://openstudy.com/codeofconduct
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