Math, asked by deepak12145, 11 months ago

do fast plz............

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Answered by ATHARVTRIVEDI

3

Sin3A + SinA = 2Sin2ACosA

Cos3A - CosA = -2Sin2ACosA

so,

It becomes :

2Sin2ACosASinA + (-2Sin2ACosACosA)

= 2Sin2ACosASinA - 2Sin2ACosASinA

= 0.

Hence proved.

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