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OpenStudy (anonymous):
if tanx=-4/3 and x is in quadrant 2, then cos2x=______.
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OpenStudy (jdoe0001):
\(\bf tan(x)=-\cfrac{4}{3}\to \cfrac{opposite}{adjacent}\to \cfrac{y}{x}\to \cfrac{y=4}{x=-3}\) |dw:1404160797321:dw| find the cosine and sine of "x" and then use them to find cos(2x) by using the double-angle identities
OpenStudy (anonymous):
wait what?
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