Math, asked by vishwajeetsingh47, 9 months ago

6. If A = 30°, verify that cos 3A = cos 2A. cos A-sin 2A sin A.

Answers

Answered by lubna165

5

LHS

cos3A

=cos3×30

=cos90

=0

RHS

cos2A.cosA-sin2A.sinA

cos2×30.cos30-sin2×30.sin30

cos60.cos30-sin60.sin 30

1/2 ×root3/2 -root 3/2×1/2

root3/4 -root3/4

0

LHS=RHS

HENCE PROVED

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