Yes, the digits of Pi are an infinite set.
No, it is not possible to list the members of an infinite set.
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infinity, the pi number keeps going on to infinity
The domain of a function is the set of values of the independent variable for which the function is valid. In practice, this is the allowable values of X or, in this case, theta. The sine and cosine functions have a domain of all numbers from negative infinity to positive infinity. The tangent function, however, is sine(theta) / cosine(theta). Cosine(theta) has value of zero at theta equal to pi / 2, 3pi/2, 5pi/2, ... in the positive direction, and -pi/2, -3pi/2, -5pi/2, ... As a result, tangent(theta) is undefined at these values, so the domain of tangent is all numbers from negative infinity to positive infinity except all numbers n pi/2 where n is odd.
It means that a problem has an infinite number of correct answers. This could mean that there are no incorrect answers at all or that infinitely many correct answers alternate with groups of incorrect answers. An example equation of the first type is 3x + 23 = 3x + 23, in which all possible values of x are correct from -infinity to +infinity. An example equation of the second type is sin(x) = 0, in which the infinite set of numbers {..., -pi, -pi/2, 0.0, pi/2, pi, ...) are correct but the numbers between members of that set are incorrect.
No. Pi is a finite number.
They are infinite because pi is an irrational number