# What is the derivative of #y=tan(x) sec(x)#?

Or, more simply:

This equation can be further simplified if desired...

Source for Trigonometric derivative proofs: "Proofs: Derivative Trig Functions." Math .com. Math .com, 2000-2005. Web. 28 August 2014.

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The derivative of ( y = \tan(x) \sec(x) ) is ( y' = \sec^2(x) \tan(x) + \tan(x) \sec(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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