Tan of pi/2 + k*pi radians, for integer k, is not defined since tan = sin/cos and the cosine of these angles is 0. Since divsiion by 0 is not defined, the tan ratio is not defined.
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The answer is undefined.
Undefined.
both are equal... infinity is the representation of undefined.
the answer is UNDEFINED. It's because any number divided to 0 is undefined.
You do not. If you do, the expression is undefined: it has no value.