Question

What is the Cartesian form of `( -12 , (-3pi)/4 )`?

Answer 1

`x=rcostheta=-12cos((-3pi)/4)=8.49`
`y=rsintheta=-12sin((-3pi)/4)=8.49`

Explanation:

To change from polar form to cartesian use the formula x = r cos theta and y = r sin theta and substitute in -12 for r and -3pi/4 for theta then simplify.