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OpenStudy (anonymous):
The point (3, -4) is on the terminal side of an angle theta . What is cos theta ? A. -3/5 B.3/5 C.-3/4 D.3/4 E. 3
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OpenStudy (anonymous):
cos = x/r(or hypo)
OpenStudy (anonymous):
how do you find r?
OpenStudy (anonymous):
r^2=a^2+b^2=c^2(this is r) r^2= 3^2 + (-4)^2 = c^2
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