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OpenStudy (anonymous):
Not sure which identities and formulas to use. If a and b are two angles in Quadrant II such that tan a=-1/2 and tan b=-2/3, find cos(a+b).
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OpenStudy (anonymous):
Wll what answer do you think it is??
OpenStudy (anonymous):
I have no idea of the answer. I was don't know which formula or identity to use to get there :)
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