You can put this solution on YOUR website! is a reference to an angle. Specifically, it is a reference to the only angle between -90 and 90 (or between and ) inclusive whose csc ratio is -1. Hint: Since csc and sin are reciprocals of each other and since the reciprocal of -1 is also -1, this same angle has a sin of -1.
is also a reference to an angle. (It is another way to write .) Specifically, it is a reference to the only angle between 0 and 180 (or between 0 and ) inclusive whose cos ratio is 0.
If you haven't already figured out the answer, then it is time to look up your special angles (and start memorizing them).
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