cos2x

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Compute the following: [[cos^2x, sin^2x],[sin^2x, cos^2x]]+[[sin^2x, cos^2x],[cos^2x, sin^2x]]

Compute the following: : [[cos^2x,sin^2x],[sin^2x,cos^2x]] + [[sin^2x,cos^2x],[cos^2x,sin^2x]]

Compute the following: [[cos^2x, sin^2x],[sin^2 x, cos^2 x]]+[[sin^2x, cos^2 x],[cos^2 x, sin^2 x]]

Prove the following: cos^2x+cos^2(x+120^@)+cos^2(x-120^@)=3/2

Prove that cos^2x+cos^2(x+pi/3)+cos^2(x-pi/3)=3/2 .

If sin x=cos^2x ,\ then write the value of cos^2x\ (1+cos^2x)dot

If: (1- cos 2x)/(1+ cos 2x)=3 , then: x =

(cos2 x - cos2 alpha)/(cos x - cos alpha)