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# Unit 6: Parametric equations, polar coordinates, and vector-valued functions

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We are used to working with functions whose output is a single variable, and whose graph is defined with Cartesian, i.e., (x,y) coordinates. But there can be other functions! For example, vector-valued functions can have two variables or more as outputs! Polar functions are graphed using polar coordinates, i.e., they take an angle as an input and output a radius! Learn about these functions and how we apply the concept of the derivative on them.

## Planar motion

### Practice

#### Quiz 1

Level up on the above skills and collect up to 480 Mastery points

## Polar functions

### Practice

#### Quiz 2

Level up on the above skills and collect up to 160 Mastery points
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#### Unit test

Level up on all the skills in this unit and collect up to 800 Mastery points!