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Question

If cosxsinx8sin2xdx=asin1(sinx+cosxb)+c, where c is a constant of integration, then the ordered pair (a,b) is equal to:

A
(1,3)
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B
(1,3)
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C
(1,3)
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D
(3,1)
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Solution

The correct option is B (1,3)
Let sinx+cosx=t
then 1+sin2x=t2
(cosxsinx)dx=dt
I=dt8(t21)
=dt9t2
=sin1(t3)+c=(sinx+cosx3)+c
a=1 and b=3

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