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The Complete Idiot's Guide to Trigonometry by Izolda Fotiyeva, Ph.D., Izolda Fotiyeva, Dmitriy Fotiyev

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Six Trigonometric Relatives

You have studied three different trigonometric ratios: the sine, the cosine, and the tangent. These three ratios are closely related, and you have already seen that 55-1.png. It is time to introduce other members of the family of trigonometric ratios.

Given the triangle.pngABC, you can identify them all:

56-1.png

In any right triangle, we have a total of six different ratios of sides. We have already given names for three of them:

The ratio between ...

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