Posted by Ruby on Saturday, June 4, 2011 at 10:39pm.
not familiar with the expession "-5 on 4"
do you mean -5/4 ?
if tanØ = -5/4 and cosØ >0
then we know Ø is in quadrant IV
by Pythagoras, the hypotenuse of the standard triangle is √41
sinØ = -5/√41
sec Ø = √41/4
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