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JEE Mains · Maths · STD 11 - Trigonometrical equations

અંતરાલ \(\left(\frac{\pi}{4}, \frac{7 \pi}{4}\right)\) માં \(x\) ની એવી કેટલી કિંમતો મળે કે જેથી  \(14 \operatorname{cosec}^{2} x-2 \sin ^{2} x=21-4 \cos ^{2} x\) થાય?

  1. A \(2\)
  2. B \(7\)
  3. C \(5\)
  4. D \(4\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(4\)

Step-by-step Solution

Detailed explanation

\(x \in\left(\frac{\pi}{4}, \frac{7 \pi}{4}\right)\) \(14 \operatorname{cosec}^{2} x-2 \sin ^{2} x=21-4 \cos ^{2} x\) \(=21-4\left(1-\sin ^{2} x\right)\) \(=17+4 \sin ^{2} x\) \(14 \operatorname{cosec} x-6 \sin ^{2} x=17\) let \(\sin ^{2} x=p\)…
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