ANSWERS: 1
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Well, that's the easy mnemonic. However, in the end the memory trick is just to remember that the opposite leg is the standard. Sine then is the standard, and the co- is the nonstandard. Therefore Sine is SOH. Cosine is CAH. Tangent is also standard, so Op/A. While Cotangent is nonstandard, A/Op. But with secants and cosecants, you're on your own.
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