# How do you simplify #2 +tan^2(x)/sec^2(x)-1#?

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Notes:

[1] I have replaced the

[2] I have use the form of the expression indicated in the comment (below).

[3] Because we have been given an expression (and not an equation) this can be simplified but it can not be solved.

To more easily see the relations involved consider the standard trig ratio triangle:

Working through the given expression a small piece at a time:

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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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