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Product of Focal Distances
For a point:
$$P(a\cos\theta,b\sin\theta)$$
the product of its focal distances is:
$$PS_1\cdot PS_2=a^2-c^2\cos^2\theta$$
Usage
- Used in problems involving products of distances from the two foci.
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Product of Focal Distances
For a point:
$$P(a\cos\theta,b\sin\theta)$$
the product of its focal distances is:
$$PS_1\cdot PS_2=a^2-c^2\cos^2\theta$$
Usage
- Used in problems involving products of distances from the two foci.
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