Proofs Using The "Other Two" Pythagorean Identities: tan^{2}X+1 = sec^{2}X & 1+cot^{2}X = csc^{2}X
These two identities show up all the time in trig proofs, but they're really easy to get mixed up (wait, does tan go with sec or csc?). So, in this video I show you a great trick to memorize them so you can write them down at the top of your quiz or test (a practice I highly recommend). I also show you how to spot trig proof problems where they'll come in handy, and work a few examples.
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