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If the integral l(n)=int(0)^(pi//4)tan^(...

If the integral `l_(n)=int_(0)^(pi//4)tan^(n)xdx` is reduced to its lower integrals like `l_(n-1),l_(n-2)` etc.,
Then `l_(2)+l_(4),l_(3)+l_(5)andl_(4)+l_(6)` are in

A

A.P.

B

G.P.

C

H.P.

D

none of these

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