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OpenStudy (anonymous):
find cos θ if sin θ =-5/13 and tan θ>0
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OpenStudy (solomonzelman):
Okay. \[Tip~~1:~~~~~~~~~~5^2+12^2=13^2\] sin= negative, so it's either 2nd or 4th quadrant tan= opp/adj and it's more than zero.
OpenStudy (solomonzelman):
|dw:1389907031254:dw| which one, in the fourth or second quadrant or both? explain?
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