If the numerator is 0, the fraction equals 0, because there is no part of the whole.
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If the numerator is 0 AND the denominator is not 0, then the ratio is 0. And cosine of 0 is 1.
If the numerator is 0 then, provided the denominator is not 0, the answer is always 0.
It is not possible to have nothing. If you don't have anything in numerator, it will be 0 (zero) by default. And when there is 0 in numerator, it doesn't matters what number is in denominator because the answer will be 0 only. So if there is nothing in the numerator but something is in the denominator, the answer will be 0.
no-it's called undefined or zero if the numerator is zero.
You can, but the result would be 0/0 which is not defined.