# How do you verify #Cos 2x= 2 sin (x+pi/4) cos (x+pi/4)#?

Explanation given below.

First let us understand two identities

Now let us take our problem

Let us start with the Right Hand side

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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