Question

What is the Cartesian form of `( -9, (-7pi)/3 )`?

Answer 1

`(-9/2, 9sqrt3/2)`

Explanation:

r =`-9` and `theta=-7pi/3`.
`x = r costheta= -9cos(-7pi/3)=-9cos(7pi/3)= -9cos(2pi+pi/3)=-9cos(pi/3)=-9/2`.
Similarly, y = `9sqrt3/2`