Let alpha in (0, pi//2) be fixed. If the...

Let `alpha in (0, pi//2)` be fixed. If the integral `int("tan x" + "tan" alpha)/("tan x" - "tan" alpha)dx = A(x)"cos 2 alpha+B(x)`
`"sin" 2 alpha +C`,where C is a constant of integration, then the functions A(x) and B(x) are respectively.

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