# How do you find the exact values of tan(5pi/12) & sin(5pi/12) using the half angle formula?

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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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- Use the product-to-sum formulas to rewrite the product as a sum or difference. 9 cos(−9β) sin 5β?
- How do you solve #2cosx + sqrt3=0# for x in the interval [0,2pi)?

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