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OpenStudy (anonymous):
Prove that the sphere x^2+y^2+z^2=a^2 and the cone x^2+y^2-z^2=0 are orthogonal at every point of intersection.
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OpenStudy (anonymous):
I know we use dot product to show that the dot product is 0. But we need a vector of some sort. Now sure how to do that...
OpenStudy (anonymous):
Can you find the points of intersection first?
OpenStudy (anonymous):
It's okay @wio. I got it.
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