How would I solve this Where would the graph of r Squareroo

Where would the graph of r = Squareroot 2 - 2 cos theta pass through the pole? 0 lessthanorequalto theta

Solution

r=sqrt2 --2cos theta

The graph passing through pole is when r=0

Sqrt2 -2cos theta=0

1-sqrt2cos theta=0

cos theta=1/sqrt2

theta=45°

theta=0°