Prove that: (i) 2 sin 5π12 sinπ12=12 (ii) 2 cos 5π12 cosπ12 (iii) – InterviewSolution

1.	Prove that: (i) 2 sin 5π12 sinπ12=12 (ii) 2 cos 5π12 cosπ12 (iii) 2 sin 5π12 cos 5π12=√3+22
Answer» Prove that: (i) $2 s i n \frac{5 π}{12} s i n \frac{π}{12} = \frac{1}{2}$ (ii) $2 c o s \frac{5 π}{12} c o s \frac{π}{12}$ (iii) $2 s i n \frac{5 π}{12} c o s \frac{5 π}{12} = \frac{\sqrt{3} + 2}{2}$

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