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OpenStudy (anonymous):
tan(arccos(-8/17))
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OpenStudy (anonymous):
dont u mean ten(across(-8/7))?
OpenStudy (phi):
A= arccos(-8/17) means cos(A) = -8/17 the cosine of some angle A is -8/17 cosine is adjacent over hypotenuse. to do this problem, it helps to make a sketch |dw:1385936590237:dw| there are two angles that have a cos of -8/17 the tan(A) will be opposite/adjacent use pythagoras to figure out the opposite side
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