Answer: The answer is (A) y = sinx.
Step-by-step explanation: We are given to select the correct function from the options that has a domain of all real numbers.
We know that only some function and cos function has a domain of all real numbers.
Thus, out of the given options, only the since function has a domain \((-\infty,\infty)\) and range of \([-1,1].\)
The domain of the other three functions are different from some function.
Thus, the correct option is (A) y = sinx.
