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January 31, 2015

January 31, 2015

Posted by **james** on Tuesday, October 4, 2011 at 10:25am.

- trig -
**Reiny**, Tuesday, October 4, 2011 at 10:55amThere are 3 co-ratios

sine vs**co**sine

secant vs**co**secant

tangent vs**co**tangent

that is, sin(x) = cos(90°-x)

so cot(17°) = tan(90-17) = tan 73° = 3.2709

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