differentiation

Question: The function $f(x)={{\tan }^{-1}}(\sin x+\cos x)$, $x>0$ is always an increasing function on the interval

1) $(0,\,\pi )$

2) $(0,\,\pi /2)$

3) $(0,\pi /4)$

4) $(0,\,3\pi /4)$

Solution:

Explanation: No Explanation

Increasing and Decreasing function

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