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find the riemann sum f(x)=x^2 +3x over the interval [0,8] where x0 =o, x1=1 , x2=6,...

find the riemann sum f(x)=x^2 +3x over the interval [0,8] where x0 =o, x1=1 , x2=6, x4=8, and c1=1, c2=2, c3=4, c4=6

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