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  4. If cos A=(3/4), then the value of expression 32 sin (A/2) sin (5 A/2) is equal to

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Q. If $\cos A=\frac{3}{4}$, then the value of expression $32 \sin \frac{A}{2} \sin \frac{5 A}{2}$ is equal to

Trigonometric Functions

Solution:

Correct answer is (a) 11