Figure N1–15
A polar function may also be expressed parametrically:
x = r cos θ, y = r sin θ
In this form, the curve r = 2 + 4 sin θ from Example 17 would be defined by:
x(θ) = (2 + 4 sin θ) cos θ, y(θ) = (2 + 4 sin θ) sin θ
BC ONLY
Example 18 __
Find the (x,y) coordinates of the point on r = 1 + cos θ where .
SOLUTION: At .
Since and , the point is
.