Question

If √3 sec theta = 2 find 4 cos³ theta - 3 cos theta

Answer 1

Let theta = x

so, we can write the ques.

as √3*sec x = 2

so, sec x = 2/√3

hence, cos x = √3/2

      So, x = 30°

We know that cos 3x = 4*cos^3 x - 3cos x

so, 4*cos^3 x - 3cos x = cos 3(30°) = cos (90°) = 0

Answer 2

hope it will help uh ..
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