document.write( "Question 826591: find in radians or degrees without using a calculator. csc-1(-1) and also y= arcos 0 \n" ); document.write( "

Algebra.Com's Answer #498283 by jsmallt9(3759) $\"\"$ $\"About$

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$\"csc%5E%28-1%29%28-1%29\"$ is a reference to an angle. Specifically, it is a reference to the only angle between -90 and 90 (or between $\"-pi%2F2\"$ and $\"pi%2F2\"$ ) 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.

\n" ); document.write( " $\"arccos%280%29\"$ is also a reference to an angle. (It is another way to write $\"cos%5E%28-1%29%280%29\"$ .) Specifically, it is a reference to the only angle between 0 and 180 (or between 0 and $\"pi\"$ ) inclusive whose cos ratio is 0.

\n" ); document.write( "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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