Question

sin2A=2sinAcosA thenA=​

Answer 1

Answer:

first you have to make a right angle figure in roughly then you can apply sin formula as p/h & cos as b/h

Step-by-step explanation:

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Answer 2

Answer:

We know that sin(A+B) = sin A cos B + cos A sin B

No, replace B by A

sin(2A)=sin A cos A + Sin A cos A = 2 sin A cos A