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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