AP Pre-Calculus
An independent variable is a variable that represents the input or cause in a function or experiment. It is the variable that you can manipulate to observe how it affects another variable, known as the dependent variable. In the context of sine and cosine function graphs, the independent variable typically represents the angle (or time) input into the trigonometric functions, allowing us to explore how changes in this variable impact the resulting values of sine and cosine.
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