Evaluate
\frac{f}{2}
Differentiate w.r.t. f
\frac{1}{2} = 0.5
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\int fx\mathrm{d}x
Evaluate the indefinite integral first.
f\int x\mathrm{d}x
Factor out the constant using \int af\left(x\right)\mathrm{d}x=a\int f\left(x\right)\mathrm{d}x.
f\times \frac{x^{2}}{2}
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}.
\frac{fx^{2}}{2}
Simplify.
\frac{1}{2}f\times \left(2^{\frac{1}{2}}\right)^{2}-\frac{1}{2}f\times 1^{2}
The definite integral is the antiderivative of the expression evaluated at the upper limit of integration minus the antiderivative evaluated at the lower limit of integration.
\frac{f}{2}
Simplify.
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