Reduction for integrals of tan^n x or cot^n x using I(n) + I(n + 2)

1. A.
   $\frac{1}{I_{2} + I_{4}},\frac{1}{I_{3} + I_{5}},\frac{1}{I_{4} + I_{6}}$ are in G.P.
2. B.
   $\frac{1}{I_{2} + I_{4}},\frac{1}{I_{3} + I_{5}},\frac{1}{I_{4} + I_{6}}$ are in A.P.
3. C.
   $I_{2} + I_{4},I_{3} + I_{5},I_{4} + I_{6}$ are in A.P.
4. D.
   $I_{2} + I_{4},\left( I_{3} + I_{5} \right)^{2},I_{4} + I_{6}$ are in G.P.

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1. A.
   50
2. B.
   49
3. C.
   51
4. D.
   25

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1. A.
   $2\pi$
2. B.
   $\pi$
3. C.
   1
4. D.
   2

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