Q. 8 A5.0( 2 Votes )

# If θ = 30°, verify that :sin 3θ = 3 sinθ – 4 sin3θ

Given: θ =30o

Now, LHS = sin 3(30o)

sin 90o

= 1

Now, RHS = 3 sin θ - 4 sin3 θ

3 sin (30o) - 4 sin3 (30o)

= 1

LHS = RHS

Hence Proved

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