differentiation

Question: If $f(x)=\sin x-\cos x,$ the function decreasing in $0\le x\le 2\pi $ is

1) $[5\pi /6,\,3\pi /4]$

2) $[\pi /4,\,\pi /2]$

3) $[3\pi /2,\,5\pi /2]$

4) None of these

Solution:

Explanation: No Explanation

Increasing and Decreasing function

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