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JEE Mains · Maths · STD 11 - 3. trignometrical ratios,functions and identities

જો કોઈક \(\alpha \in R \) માટે \(15 \sin ^{4} \alpha+10 \cos ^{4} \alpha=6\) આપલે હોય તો \(27 \sec ^{6} \alpha+8 \operatorname{cosec}^{6} \alpha\) ની કિમંત મેળવો.

  1. A \(350\)
  2. B \(500\)
  3. C \(400\)
  4. D \(250\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(250\)

Step-by-step Solution

Detailed explanation

\(15 \sin 4 \alpha+10 \cos ^{4} \alpha=6\) \(15 \sin ^{4} \alpha+10 \cos ^{4} \alpha=6\left(\sin ^{2} \alpha+\cos ^{2} \alpha\right)^{2}\) \(\left(3 \sin ^{2} \alpha-2 \cos ^{2} \alpha\right)^{2}=0\) \(\tan ^{2} \alpha=\frac{2}{3} \cdot \cot ^{2} \alpha=\frac{3}{2}\)…
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