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The tangent plane of   f (x, y)  =  4x2y − 5xy3 at the point (1,1) can...

The tangent plane of   f (x, y)  =  4x2y − 5xy3 at the point (1,1) can be expressed in the form z  =  ax + by + c.
(a) What is the value of a?
(b) What is the value of c?

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