Q. 374.1( 19 Votes )

Prove: <span lang

Answer :

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.


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