Question

What is the Cartesian form of `(-13,(5pi)/16))`?

Answer 1

Polar form `(r,theta)=(-13,(5pi)/16)`
`r=-13` and `theta=(5pi)/12`
`x=rcostheta` and `y=rsintheta`

`x=rcostheta=-13 cos((5pi)/12)`
and
`y=rsintheta=-13 sin((5pi)/12)`