PreCalculus
posted by Iris .
A.Verify the identity.
B.Determine if the identity is true for the given value of x. Explain.
Sec(x) / tan(x) = tan(x) / [tan(x) – cos(x)],x = π
I already solved A and I believe it's true; however, I need help with B.

clearly B is false at x=π
Sec(x) / tan(x) = tan(x) / [tan(x) – cos(x)]
(1)/0 = 0/(0(1)) = 0/1
∞ = 0
I don't think so!
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