Question

sin 2 A=2sinA is true when A is equal to____________________.

Answer 1

hi friend.,


given sin2A=2sinA


we know that sin2A=2sinAcosA

so, 2sinAcosA=2sinA


divide with 2sinA on both sides ,we get


cosA=1

cosA=cos0

A=0


I hope this will help u :)

Answer 2

HEY !

As we know 
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Sin 2 A = 2 SinA CosA  

2 SinA= 2 SinA Cos A 

Here it possible only if the value of the Cos A = 1 

Now as we know that Cos 0° = 1 

So , The value of the A = 0°
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