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flyers
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Homework Statement
Find the equation f(x) who's integral is [tex]\int x^{3}[/tex] and has a tangent x+y=0
Homework Equations
The Attempt at a Solution
I know that f(x) is 1/4x4+c because of the integral. The tangent is the derivative of f(x) at some point
i have the equations
y=x3+c
y=-x
but solving these equations gives me two unknowns...