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Question

If sec2x2010sin2010x dx=P(x)(sin x)2010+C


A

P(π4)=12

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B

P(π3)=3

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C

P(π2)=1

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D

P(π8)+P(π4)=2

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Solution

The correct option is B

P(π3)=3


sec2x2010sin2010xdx
=sec2xsin2010xdx2010sin2010xdx
=tan x(sin x)2010+2010tan x cos x(sin x)2011dx2010sin2010xdx+C (Applying Integration by parts in the first expression)
=tan x(sin x)2010+2010(sin x)2010dx2010sin2010xdx+C
=tan x(sin x)2010+C
P(π3)=tan π3=3


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