Question

sin2A=2sinA prove
plzzzz answer

Answer 1

sin(2A) = sin(A + A) 

As sin(a + b) = sinacosb + sinbcosa, 

sin(A + A) = sinAcosA + sinAcosA 

Therefore sin(2A) = 2sinAcosA

Answer 2

Heya!!

MISTAKE IN UR QUESTION

QUESTION SHOULD BE LIKE THIS

PROVE THAT Sin2A = 2 Sin A × Cos A

PROOF

L.H.S

Sin 2A = Sin ( A + A ) = Sin A Cos A + Cos A Sin A

= 2 Sin A × Cos A

HENCE PROVED.