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If bn=int0^(pi/2) (cos^2nx)/sinx dx then...

If `b_n=int_0^(pi/2) (cos^2nx)/sinx dx` then

A

`b_3 - b_2, b_4 – b_3, 6_5 – b_4` are in an A.P. with common difference -2

B

`1/(b_3-b_2),1/(b_4-b_3),1/(b_5-b_4)` are in an A.P. with common difference 2

C

`b_3-b_2 , b_4 -b_3 , b_5-b_4` are in a G.P.

D

`1/(b_3-b_2),1/(b_4-b_3),1/(b_5-b_4)` are in an A.P. with common difference -2

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