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OpenStudy (anonymous):
use differentation 4x^2+y^2-8x+4y=0 has vertical and horizontal tangents
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OpenStudy (anonymous):
What are we trying to find here, the derivative?
OpenStudy (anonymous):
well derivate i know but find vertical and horizontal lines
OpenStudy (anonymous):
Horizontal... solve for the derivative = 0. Vertical, solve for the derivative = undef or inf/-inf
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