# How to find exact value COS(SIN^-1 4/5+TAN^-1 5/12) ?

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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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- Given a right triangle #triangle ABC# with #C=90^circ#, if b=12, c=13, how do you find a?
- If a triangle has sides 6, 8, and 10, is it acute, right, or obtuse?
- How do you evaluate the expression #cotpi#?

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