make a sketch in III
y = -5, r = 13 , then
x^2 + (-5)^2 = 169
x = -12 in III
sinŲ = -5/13, cscŲ = -13/5
cosŲ = -12/13, secŲ = -13/12
tanŲ = -5/-12 = 5/12
cotŲ = 12/5
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