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Solve the following integral: 0 2π dϕ 1 + q p cos ϕ 2 = 0 2π p 2 dϕ p+q cos ϕ 2 . Put . t= tan ϕ 2 so that dt= 1 2 sec 2 ϕ 2 dϕ , where dt= 1 2 1+ tan 2 ϕ 2 dϕ= 1 2 1+ t 2 dϕ , so that ... ................
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