- Calculus help! Let f(x)=(2x−2x^3)(3+x^[1/2]). Find f′(x).?

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If x^2+y^2 = 6, and x+y=3, then what is x^3+y^3? Number Theory: Find the roots of 4x^2+6x+1 in Z11 (could you please explain step by step? THANKS!)? Solve the equation for x.
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