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Question

If sin1xcos1xdx=f1[π2xxf1(x)21x2]+π21x2+2x+C then f(x) is equal to

A
sin 3x
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B
sin 2x
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C
sin x
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D
sin 4x
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Solution

The correct option is C sin x
sin1xcos1xdx=[π2sin1x(sin1x)2]dxπ2(xsin1x+1x2)(x(sin1x)2+2sin1x1x22x)+c(Integration by parts)
sin1x[π2xx sin1x21x2]+π21x2+2x+cf1(x)=sin1x,f(x)=sinx

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