Question

Can someone please help me

Answer 1

Hey bro:)

Given 4 sin a sin(60-a) sin(60 + a) can be written as

           4 sin a ((sin 60 - a) + sin (60 -

a))

           4 sin a(sin^2 60 - sin^2 a)

           4 sin a((root 3/2)^2 - sin ^2 a)

           4 sin a(3/4 - sin^2 a)

           4 ( 3 sin a - 4 sin^3 a/4)

           4(1/4(sin 3a)

            sin 3a

Hope it helps!

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