Basic Trigonometric Identities: Pythagorean Identities and Cofunction Identities

Now that we know what these trigonometric functions are, how do they relate to one another? In a variety of ways, in fact! There are lots of identities we will have to learn so that we can do algebra with trig functions later, so let's learn these now.

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Basic Trigonometric Identities: Pythagorean Identities and Cofunction Identities
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