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Mathematics 10 Online
OpenStudy (anonymous):

If the point P(\frac{10}{13},y) is on the unit circle in quadrant IV, then y=

OpenStudy (ybarrap):

|dw:1393703358884:dw| $$ y=-\sqrt{1-\left(\cfrac{10}{13}\right)^2} $$ The negative sign comes because we know that point is in quadrant IV.

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