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

ધારોકે \(\frac{\pi}{2}<\theta<\pi\) અને \(\cot \theta=-\frac{1}{2 \sqrt{2}}.\) તો \(\sin \left(\frac{15 \theta}{2}\right)(\cos 8 \theta+\sin 8 \theta)+\cos \left(\frac{15 \theta}{2}\right)(\cos 8 \theta-\sin 8 \theta)\) નું મૂલ્ય ___ છે.

  1. A \( \frac{1-\sqrt{2}}{\sqrt{3}} \)
  2. B \( -\frac{\sqrt{2}}{\sqrt{3}} \)
  3. C \( \frac{\sqrt{2}-1}{\sqrt{3}} \)
  4. D \( \frac{\sqrt{2}}{\sqrt{3}} \)
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Answer & Solution

Correct Answer

(A) \( \frac{1-\sqrt{2}}{\sqrt{3}} \)

Step-by-step Solution

Detailed explanation

\(\frac{\pi}{2}<\theta<\pi\) and \(\cot \theta=-\frac{1}{2 \sqrt{2}}\) \(\Rightarrow \sin \left(\frac{15 \theta}{2}\right)(\cos 8 \theta+\sin 8 \theta)\) \(+\cos \left(\frac{15 \theta}{2}\right)(\cos 8 \theta-\sin 8 \theta)\)…
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