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2.the graph of x^2 -xy+y^2=6 is a tilted ellipse. Find the coordinated on which the tangent...

2.the graph of x^2 -xy+y^2=6 is a tilted ellipse. Find the coordinated on which the tangent line is horizontal

3.Consider the function f(x)=x^2+2x-1 over the interval [3,7] Calculate the riemann sum R4.

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