Question

Prove-

sin^3A * sin^3(120+A) * sin^3(sin240+A) = 3/4 cos3A

Answer 1

Answer on Question #46597 – Math – Trigonometry

Prove-

$$\sin^2 3 A ^ {*} \sin^2 3 (1 2 0 + A) ^ {*} \sin^2 3 (\sin 2 4 0 + A) = 3 / 4 \cos 3 A$$

Solution.

This equality is not true, because

for $A = 0$ , $\sin A = 0$ , $\cos A = 1$ , and we have $0 = \frac{3}{4}$

www.AssignmentExpert.com