Question

The point $(r,\theta)$ in polar coordinates is $(7,5)$ in rectangular coordinates. what is the point $\left( 2r, \theta + \frac{\pi}{2} \right)$ in rectangular coordinates?

Answer 1

x=r cos(theta) y=rcos(theta)

Explanation:

Tan(theta)=cos/sin as well as x/y therefore cos=x and sin=y

Wrong question sry didnt read