Question

19-sin 2A=2 sin A is true when A is:
O 0°
O
30°
O
O
45°
O
60°
​

Answer 1

Answer:

30 degree...........

Answer 2

Answer:

we know, that sin2A = 2sinAcosA

let,

sin2A = 2sinA

then,

sin2A-2sinA=0

2sinAcosA-2sinA = 0

2sinA(cosA-1)=0

2sinA = 0

sinA = 0

we know sin 0 = 0

therefore, A must be 0

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