# How do you find the derivative of #cos^4(x)-sin^4(x)#?

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To find the derivative of ( \cos^4(x) - \sin^4(x) ), you can use the chain rule and the power rule. The derivative is ( -4\cos^3(x)\sin(x) + 4\sin^3(x)\cos(x) ).

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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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