单词	parametric equations
释义	Parametric Equations A set of functions linked by one or more independent variables (called the parameters). For example, here are two functions linked by the parameter "t": • x = cos(t) • y = sin(t) As t goes from 0 to 2π the x and y values make a circle! at t=0: x=1 and y=0 (the right side of the circle) at t=π/2: x=0 and y=1 (the top of the circle) at t=π: x=−1 and y=0 (the left side of the circle) etc. Parametric Equations are very useful for defining curves, surfaces, etc
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