Question

Prove that sin 120°=sin 60°

Answer 1

Sin120°= Sin60°

sin120°can be written as sin+2×60)

we know that

sin(2×angle)=2cos(angle)×sin(angle)

here angle=60°

we know that cos60°=1/2

therefore We get sin60°

hence sin120°=sin60°=0.866

also sin120°=Sin(90+30)=cos30

=0.866

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