Q. 8 A5.0( 2 Votes )

If θ = 30°, verify that :

sin 3θ = 3 sinθ – 4 sin3θ

Answer :

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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