Question

Sin 2A = Cos A then A = ?​

Answer 1

As we know that sin2A=2cosA.sinA

Now in the given equation

sin2A=cosA

Using the identity,we have

2cosA.sinA=cosA

∴sinA=

2

1

A=30°

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Answer 2

Answer:

As we know that sin2A=2cosA.sinA

Now in the given equation

sin2A=cosA

Using the identity,we have

2cosA.sinA=cosA

∴sinA= 1/2

A=30∘