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Q.

If In=cotnxdx , and  I0+I1+2I2++I8

+I9+I10=Au+u22++u99 , where u=cotx then 

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a

A=1

b

A = 1

c

A =1/2 

d

A = 1/2

answer is B.

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Detailed Solution

detailed_solution_thumbnail

 In+In+2=cotnxcosec2xdx=1n+1cotn+1x

Now , 

I0+I1+2I2+I3++I8+I9+I10=I0+I2+I1+I3+I2+I4++I7+I9+I8+I10=u+12u2+13u3++19u9

where , u=cotx

Thus , A=-1

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