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[edit] What is an identity?

Trigonometry is a useful science by itself for such job applications as a surveyor, or an architect. However, many jobs require plenty of trigonometry, and it is not because of triangles. It is because the trigonometric functions can be changed into themselves in different forms. This is why you learn trigonometry before calculus; it is essential that you can bend these equations to suit your needs! Let's just jump in.

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