trigonometry

Question: One root of the equation $\cos x-x+\frac{1}{2}=0$lies in the interval

1) $\left[ 0,\,\frac{\pi }{2} \right]$

2) $\left[ -\frac{\pi }{2},\,0 \right]$

3) $\left[ \frac{\pi }{2},\,\pi \right]$

4) $\left[ \pi ,\frac{3\pi }{2} \right]$

Solution:

Explanation: No Explanation

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