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Mathematics 8 Online
OpenStudy (anonymous):

HELP! Given: cos theta= -4/5, sin x = -12/13 , theta is in the third quadrant, and x is in the fourth quadrant; evaluate sin theta.

OpenStudy (superdavesuper):

sinx with x in the 4th quadrant - that means sinx is +ve or -ve?

OpenStudy (anonymous):

positive?

OpenStudy (superdavesuper):

Check the circle near the bottom out: http://www.mathstat.strath.ac.uk/basicmaths/321_trigratiosforanglesofanysizeorsign.html

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