To test whether a polar graph is symmetric about the -axis
MATHEMATICS · Single correct · AP · AP Precalculus · Trigonometric and Polar Functions · Trigonometric and Polar Functions
Problem
To test whether a polar graph r=f(θ) is symmetric about the x-axis, which substitution should be made, with the requirement that the resulting expression be unchanged?
(a) Replace θ with θ+π
(b) Replace θ with −θ
(c) Replace θ with π−θ
(d) Replace r with −r while keeping θ unchanged