Question

For what value of a sin 2A equal to 2 sin a

Answer 1

Answer:

Step-by-step explanation:

given  

Sin 2A = 2 SinA

by double angle formula

2SinA CosA = 2 SinA

2SinA(CosA-1)=0

2 SinA =0 or CosA 1=0

SinA =0 or CosA=1

∴ SinA =0

Answer 2

Answer:

given:--- sin 2 A =2 sin A

solution :----

using sin 2 theta = 2 sin theta cos theta

sin 2 A=2 sin A cos A

2sin A = 2 sin A cos A

cos A = 1

cos 0 = 1

therefore , cos A = cos 0

therefore , A = 0