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

यदि \(10 \sin ^4 \theta+15 \cos ^4 \theta=6\), तो \(\frac{27 \operatorname{cosec}^6 \theta+8 \sec ^6 \theta}{16 \sec ^8 \theta}\) का मान क्या है:

  1. A \(\frac{2}{5}\)
  2. B \(\frac{3}{4}\)
  3. C \(\frac{3}{5}\)
  4. D \(\frac{1}{5}\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(\frac{2}{5}\)

Step-by-step Solution

Detailed explanation

\(10\left(\sin ^2 \theta\right)^2+15\left(1-\sin ^2 \theta\right)^2=6\) मान लीजिए \(\sin ^2 \theta=t \Rightarrow 10 t^2+15(1-t)^2=16\) \(10 t^2+15-30 t+15 t^2=6\) \(25 t^2-30 t+9=0\) \((5 t-3)^2=0\) \(\sin ^2 \theta=\frac{3}{5}\) और \(\cos ^2 \theta=\frac{2}{5}\)…
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