write the following rectangular equation in polar form:
x^2 - y^2 = 1
also for x^2 + y^2 = 25, would the answer be r=5?
(r cos θ)^2 - (r sin θ)^2 = 1
r^2 cos^2 θ - r^2 sin^2 θ = 1
r^2 ( cos^2 θ - sin^2 θ) = 1
r^2 (cos 2 θ) = 1
x^2 + y^2 = 25
r^2 = 25
r = 5