Question

Find the rectangular coordinates of the point with the polar coordinates (-7, 5pi/3)

Answer 1

`\left(7\cdot\cos (5\pi)/(3),7\cdot\sin(5\pi)/(3)\right)=\left(7\cdot(1)/(2),7\cdot\left(-(\sqrt3)/(2)\right)\right)=\\ \left((7)/(2),-(7\sqrt3)/(2)\right)`