Q. 275.0( 4 Votes )

Choose the correct alternative in the following:

If then is equal to

A.

B.

C.

D. none of these

Answer :


Let x3 = cos p and y3 = cos q


cos-1x3 = p and cos-1y3 = q --- (1)





Comparing L.H.S and R.H.S we get,







Substituting value of p and q from (1)



Differentiating w.r.t x we get,




Comparing L.H.S and R.H.S we get


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