SOLUTION: I would appreciate some help verifying this identity: tan((-pi/2)+x)=-cot x It may not be verifiable.

Question 453268: I would appreciate some help verifying this identity:
tan((-pi/2)+x)=-cot x
It may not be verifiable.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
verifying this identity:
tan((-pi/2)+x)=-cot x
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Left side change:
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[(tan(-pi/2)+tan(x))/(1-tan(-pi/2)*tan(x)] = -cot(x)
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Simplify left side:
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Comment: tan(-pi/2) is undefined, so the left side is undefined
and cannot equal the right side.
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Cheers,
Stan H.
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