# For #f(x)=1/cosx# what is the equation of the tangent line at #x=(3pi)/2#?

There is no tangent line at

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The equation of the tangent line at x=(3pi)/2 for f(x)=1/cosx is y=0.

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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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