# Use trigonometric identities to simplify the expression. ?

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sec^(2)(x)-sec^(2)(x)csc^(2)(x)

sec^(2)(x)-sec^(2)(x)csc^(2)(x)

Recall this identity:

So:

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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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