Question

What is the Cartesian form of `(7,(13pi)/8)`?

Answer 1

`(x,y)=(7cos((13pi)/8),7sin((13pi)/8))`

Explanation:

Changing from Polar Coordinates to Catestian Coordinates
`x=rcostheta`
`y=rsintheta`
so
`x=7cos((13pi)/8)`
`y=7sin((13pi)/8)`