Trig
posted by Jon .
P(15/17,8/17) is found on the unit circle. Find sin theta and cos theta.
P(15/17,8/17)= P(cos theta,sin theta)
sin=8/17
cos=15/17

Trig 
drwls
The x side, y side and radius form a right triangle with side ratio 8:15:17
cos theta is x/r = 15/17 and sin theta is 8/17
So your answer is correct
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