Choose the correct alternative in the following: If then is equal to

Question

Philoid · Accepted 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