Why is sec(0) = 1?
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The secant function is defined as the reciprocal of the cosine function. In trigonometry, the cosine of 0 degrees (or 0 radians) is equal to 1. Therefore, the secant of 0 degrees (or 0 radians) is equal to the reciprocal of 1, which is also 1.
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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.
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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