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Q.

The value of ∫0sin2xsin-1tdt+∫0cos2xcos-1tdt is

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a

π

b

π2

c

π4

d

1

answer is B.

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Detailed Solution

Let I1=∫0sin2xsin−1tdt Put t=sin2u⇒dt=2sinucosudu⇒dt=sin2udu∴I1=∫0xusin2udu Let I2=∫0cos2xcos−1td Put t=cos2v⇒dt=−2cosvsinvdv⇒dt=−sin2vdv∴I2=∫π2xv(−sin2v)dv=−∫π2xvsin2vdv=−∫π2xusin2udu[ change of variable ]∴I=I1+I2=∫0xusin2udu−∫π2xusin2udu=∫0π2usin2udu+∫π2xusin2udu−∫π2xusin2udu=∫0π2usin2udu=π4 [Integratebyparts
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