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Differentiate w.r.t. x
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\int \frac{1}{4}\mathrm{d}x+\int \frac{4}{x^{3}}\mathrm{d}x
Integrate the sum term by term.
\int \frac{1}{4}\mathrm{d}x+4\int \frac{1}{x^{3}}\mathrm{d}x
Factor out the constant in each of the terms.
\frac{x}{4}+4\int \frac{1}{x^{3}}\mathrm{d}x
Find the integral of \frac{1}{4} using the table of common integrals rule \int a\mathrm{d}x=ax.
\frac{x}{4}-\frac{2}{x^{2}}
Since \int x^{k}\mathrm{d}x=\frac{x^{k+1}}{k+1} for k\neq -1, replace \int \frac{1}{x^{3}}\mathrm{d}x with -\frac{1}{2x^{2}}. Multiply 4 times -\frac{1}{2x^{2}}.
\frac{x}{4}-\frac{2}{x^{2}}+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.