Q. 275.0( 4 Votes )

Choose the correct alternative in the following:

If then is equal to




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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