Please help. Find a polar equation for the curve represented by the Cartesian equation x^2-y^2=4

8. Find a polar equation for the curve represented by the Cartesian equation x2 - y' = 4. Or= cos(0) +sin(0) 4 Or = 4 cos(20) Or= 4 cos(0) -sin(0) 1 Or = 1+2 cos (0) Or = 4 cos (20) Or =2