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If I(n)=int(0)^(pi//4) tan^(n)x dx, (ngt...

If `I_(n)=int_(0)^(pi//4) tan^(n)x dx, (ngt1` is an integer ), then (a) `I_(n)+I_(n-2)=1/(n+1)` (b) `I_(n)+I_(n-2)=1/(n-1)` (c) `I_(2)+I_(4),I_(6),…….` are in H.P. (d) `1/(2(n+1))ltI_(n)lt1/(2(n-1))`

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