1.

If f(p,q)=int_(0)^(pi//2)cos^(p)x cos qx dx, then :

Answer»

<P>`F(p, Q)=(q)/(p+q)f(p-1,q-1)`
`f(p,q)=(p)/(p+q)f(p-1,q-1)`
`f(p,q)=(-p)/(p+q)=(-p)/(p+q)f(p-1,q-1)`
`f(p,q)=(-q)/(p+q)f(p-1,q-1)`

ANSWER :B


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