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If I1=int(-1)^1(tan^(-1)x+tan^(-1)(1/x))...

If `I_1=int_(-1)^1(tan^(-1)x+tan^(-1)(1/x))dx&I_2=int_(-1)^1(cot^(-1)x+cot^(-1)(1/x))dx ,` then
(a)`I_1=I_2+2pi`
(b) `I_1=I_2`
(c)`I_2=2pi+I_1`
(d) `I_1=pi`

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