# What is the derivative of #-sin(x)#?

Here is the correct derivation; the previous answer has errors.

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The derivative of -sin(x) is -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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- How do you find the derivative of #f(x)= 3cos(2x) + sin(2x)#?

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