If cos A = then the value of sin A 2 sin 5 ~A 2 is
Mathematics · JEE Advanced · NTA Exams — Trigonometry
If cos A = 
then the value of sin \(\frac{\mathrm{A}}{2}\) sin \(\frac{5 \mathrm{~A}}{2}\) is
then the value of sin \(\frac{\mathrm{A}}{2}\) sin \(\frac{5 \mathrm{~A}}{2}\) is- 1/32
- 11/8
- –89/8
- 11/16
Answer
(C) –89/8
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