#18 Precalculus questions

label Mathematics
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May 15th, 2015

arccos(3/5) is an angle between 0 and pi whose cos is 3/5.

Then its sin is +-sqrt(1 - (3/5)^2) = +-(4/5).

Choose "+" because sin is >=0 for angles between 0 and pi.
The answer is 4/5.

May 15th, 2015

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