trigonometry

Question: The solution of equation ${{\cos }^{2}}\theta +\sin \theta +1=0$ lies in the interval

1) $\left( -\frac{\pi }{4},\frac{\pi }{4} \right)$

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

3) $\left( \frac{3\pi }{4},\frac{5\pi }{4} \right)$

4) $\left( \frac{5\pi }{4},\frac{7\pi }{4} \right)$

Solution:

Explanation: No Explanation

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