Posted by Ryan on Tuesday, October 11, 2011 at 8:06pm.
make a triangle and you should reconize the 3-4-5 right-angled triangle.
but we know tan(π/2 - Ø) = cotØ , coterminal ratios
since Ø is in II , tan Ø = -3/4
cotØ = 1/tanØ = -4/3
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