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3) Find a polar equation of the conic in terms of r with its focus at...

3) Find a polar equation of the conic in terms of r with its focus at the pole. ( r=???)

a)(4, π/2) (parabola)

b) (4, 0), (12, π) (eclipse)

c) (8,pi/2), (16,3pi/2) (eclipse)

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