Question

sin 2A = 2 sin A is true when A = ? with solution please​

Answer 1

sin2A=2sinA

2sinA*cosA=2sinA

cosA=2sinA/2sinA

cosA=1

A=0

Answer 2

$sin \:2A = 2 sin \:A ( Given )$

$\implies sin\:2A - 2sin\:A = 0$

$\implies 2sin\:A cos\:A - 2sin \:A = 0$

$\boxed {\pink { sin \:2A = 2sinAcosA }}$

$\implies 2sin A ( cosA - 1 ) = 0$

$\implies 2sinA = 0 \:Or \: cosA - 1 = 0$

$\implies sinA = 0 \:Or \: cosA = 1$

$\implies sinA = sin \:0\degree \:Or \: cosA = cos\:0\degree$

$\implies A = 0 \degree \:Or \: A = 0\degree$

Therefore.,

$\red { Value \: of \: A } \green {= 0 \degree }$

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