Question

What is the domain and range of `f(x) = 1 + tan^2 x`?

Answer 1

The domain of the tangnet is: `x!=pi/2+kpi`.

The range of this function is `[1,+oo)`, and this is because the function `tan^2x` has range `[0,+oo)` because it is a square, and there is the `1`...