well? since tan90 is undefined as well is sec90... how does cot90=0

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- Feb 22nd 2009, 02:14 AM #1

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- Feb 22nd 2009, 02:18 AM #2

- Feb 22nd 2009, 06:40 AM #3

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Draw several right triangles with one angle 90 degrees (of course) and another angle close to 90 degrees, keeping the hypotenuse of constant length. $\displaystyle cos(\theta)$ is "near side over hypotenuse". As $\displaystyle \theta$ approaches 90 degrees, the "near" gets shorter and shorter: $\displaystyle cos(\theta)$ goes to 0.

As to your refernce to tangent and secant: both of those have cosine in the [b]denominator[b] while the numerator is 1: in a limiting sense, 1/0= infinity.