# Is there a formula for #root(x)(a) xx root(y)(a)#? For example, #sqrt(81) xx root4(81)#

There isn't a formula—that is, a commonly used method—for solving these kinds of issues, but mathematics is full of surprises, so that doesn't mean a formula can't exist.

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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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