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I have trouble with second derivative , I am not sure if I have skipped some
important rules , please help me step by step or point out my error.
here is what I did with (1)
Numbers are the essence of the Universe
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That seems to be the same answer as yours, isnt it?
which is what you should expect for an origin-centred ellipse.
Last edited by JaneFairfax (2007-04-01 21:16:13)
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I checked my book , it said the answer is
Last edited by Stanley_Marsh (2007-04-01 21:36:50)
Numbers are the essence of the Universe
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Argh, thats a different curve!
is not an ellipse; its a hyperbola. The general equation for a hyperbola is
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I think we want an ellipse, not hyperbola, for this question, i.e.
And, actually, we could simplify what we had obtained earlier.
You were doing the right thing. You just needed to simplify the answer you had for the second derivative.
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OH!!!!!!! You can replace
NEVER THOUGHT OF THAT!!!!Last edited by Stanley_Marsh (2007-04-02 02:29:37)
Numbers are the essence of the Universe
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