APFIVE Rate of Change of Polar Distance
The polar function $$r = f(\theta)$$ has the property that $$f'(\theta) < 0$$ for all $$\theta$$. For which values of $$\theta$$ is the distance from the origin decreasing?
A
Only when $$f(\theta) = 0$$
B
Whenever $$f(\theta) > 0$$
C
If $$f(\theta) < 0$$
D
For every value of $$\theta$$
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