Q37 of 271 Page 352

Prove:

Given:

First solve for I1:

Let cos x = t ⇒ -sin x dx = dt ⇒ sinx dx = -dt

When x=0 then t= 1 and when x = π /2 then t = 0

Put in equ. (2)

L.H.S = R.H.S

Hence Proved.

Prove: