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f(x)=(s i nx)/(sqrt(1+tan^2x))+(cos x)/(...

`f(x)=(s i nx)/(sqrt(1+tan^2x))+(cos x)/(sqrt(1+cot^2x))` is constant in which of following interval a.`\ (0,\ pi/2)` b. `(pi/2,\ pi)` c. `(pi,\ (3pi)/2)` d. `((3pi)/2,2pi)`

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