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OpenStudy (anonymous):
sin theta = -5/13 and the theta is a quadrand III angle.find the value of cos theta. is it cos^2-sin^2=1 or cos^2+sin^2=1 ?
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OpenStudy (anonymous):
cos^2+sin^2=1 is correct
OpenStudy (anonymous):
cos theta is -12/13 right?
OpenStudy (anonymous):
yes
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