**Domain and Range of a Function - intmath.com**
https://www.intmath.com/functions-and-graphs/2a-domain-and-range.php

The domain of y = sin x is "all values of x", since there are no restrictions on the values for x. (Put any number into the "sin" function in your calculator. Any number should work, and will give you a final answer between −1 and 1.) From the calculator experiment, and from observing the curve, we can see the range is y betweeen −1 and 1.We could write this as −1 ≤ y ≤ 1.

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