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Mathematics 22 Online
OpenStudy (anonymous):

If the point P(-\frac{4}{5},y) is on the unit circle in quadrant II, then y=

jimthompson5910 (jim_thompson5910):

hint: x^2 + y^2 = 1

jimthompson5910 (jim_thompson5910):

also, x = -4/5 in this case

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