A Problems a to c, use a computer or graphing calculator to graph the given equation. Make sure that you choose a sufficiently large interval for the parameter so that the entire curve is drawn.
a. r = √1 - 0.5 sine2θ
b. r = cos(13θ/5)
c. r = sin(5θ/7)
d. r = 1 + 3 cos(θ/3)