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Trigonometric Functions — Maths STD 11 Science — Question

CBSE BoardEnglish MediumSTD 11 ScienceMathsTrigonometric Functions1 Mark
MCQ
The solution of the equation $\cos^2\text{q}+\sin\text{q}+1=0, $ lies in the interval:
  • A
    $\Big(\frac{\pi}{4},\frac{\pi}{4}\Big)$
  • B
    $\Big(\frac{-\pi}{4},\frac{3\pi}{4}\Big)$
  • C
    $\Big(\frac{-3\pi}{4}, \frac{5\pi}{4}\Big)$
  • ✓
    $\Big(\frac{5{\pi}}{4},\frac{7\pi}{4}\Big)$
✓

Answer

Correct option: D.
$\Big(\frac{5{\pi}}{4},\frac{7\pi}{4}\Big)$

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