Asked by hussain

What is meant by “the domain of a function is (−∞, ∞)”?
Answered by Damon
that means there is a y for every value of x between −∞ and +∞
for example that would not be true for
y = 7/ (x-1)
because there is no y when x = 1
Answered by oobleck
just for future reference, this domain is good for
all polynomials
all exponentials
all sines and cosines