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Most people easily remember
this first identity... But, often times, you'll need to remember
the other two when you get to Calculus. Here's an easy way to derive
the next two, starting from the first one:
2) Divide everywhere by
Simplifying gives us the second
Pythagorean Identity...
3) Divide everywhere by
Simplifying gives us the third
and final Pythagorean Identity...
*
I always remember that the "co" guys go together!
(cotangent and cosecant)
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