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Evaluate
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Differentiate w.r.t. x
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\int x^{3}+2x+1\mathrm{d}x
Apply rule a^{\log_{a}\left(b\right)}=b, where a=e and b=x^{3}+2x+1.
\int x^{3}\mathrm{d}x+\int 2x\mathrm{d}x+\int 1\mathrm{d}x
Integrate the sum term by term.
\int x^{3}\mathrm{d}x+2\int x\mathrm{d}x+\int 1\mathrm{d}x
Factor out the constant in each of the terms.
\frac{x^{4}}{4}+2\int x\mathrm{d}x+\int 1\mathrm{d}x
Since \int x^{k}\mathrm{d}x=\frac{x^{k+1}}{k+1} for k\neq -1, replace \int x^{3}\mathrm{d}x with \frac{x^{4}}{4}.
\frac{x^{4}}{4}+x^{2}+\int 1\mathrm{d}x
Since \int x^{k}\mathrm{d}x=\frac{x^{k+1}}{k+1} for k\neq -1, replace \int x\mathrm{d}x with \frac{x^{2}}{2}. Multiply 2 times \frac{x^{2}}{2}.
\frac{x^{4}}{4}+x^{2}+x
Find the integral of 1 using the table of common integrals rule \int a\mathrm{d}x=ax.
\frac{x^{4}}{4}+x^{2}+x+С
If F\left(x\right) is an antiderivative of f\left(x\right), then the set of all antiderivatives of f\left(x\right) is given by F\left(x\right)+C. Therefore, add the constant of integration C\in \mathrm{R} to the result.