Math, asked by umalimbu39, 11 months ago

help me to solve this problem by conversion

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Answered by wwwshreehari9865

1

Answer:

2sin(A-1)=0

SinA=1/2

SinA=Sin30

=>A=30

NOW

LHS:Sin3A=Sin90°=1

RHS:3SinA-4sin^3A

=3Sin30°-4Sin^330

=2×(1/2)-4(1/2)^3

3/2-1/2=1

LHS=RHS

HENCE PROVED

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