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OpenStudy (anonymous):
Find equations of both tangent lines to the ellipse at the point (4,0)
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OpenStudy (anonymous):
\[x^2/4 + y^2/9 = 1\]
OpenStudy (anonymous):
Take the derivative 2x/4 + 2yy'/9 = 0 We can solve for y' y' = -9xy/4 Do you know the next step?
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