# How to answer question no .1 ?

I got A.

I considered the diagram:

where I added some information to help the resolution.

Let us consider triangle HJK. From trigonometry we get:

so that:

Now consider triangle HPK, we get:

and:

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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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