The function f(x)""=""t a n^(-1)(sinx""+...

The function `f(x)""=""t a n^(-1)(sinx""+""cosx)` is an increasing function in (1) `(pi/4,pi/2)` (2) `(-pi/2,pi/4)` (3) `(0,pi/2)` (4) `(-pi/2,pi/2)`

`((pi)/(4), (pi)/(2))`

`(-(pi)/(2), (pi)/(4))`

`(0, (pi)/(2))`

`(-(pi)/(2), (pi)/(2))`

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