Q. 185.0( 1 Vote )

Mark the Correct alternative in the following:

The value of is equal to

A.cos x

B. sin x

C. tan x

D. None of these

Answer :

Given expression is


Consider



[using the formulae cos 3x = 4 cos3 x – 3 cos x and


cos 2x = 2cos2x -1]




= cos x


Therefore


Hence the answer is option A.

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