Matematyka
$f(x) =$ | $\dfrac{x{\cdot}\cos\left(x\right)}{2}$ |
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$\displaystyle\int{f(x)}\, \mathrm{d}x =$ | $\dfrac{x{\cdot}\sin\left(x\right)+\cos\left(x\right)}{2}+{C}^{\color{#a0a0a0}{\href{http://en.wikipedia.org/wiki/Constant_of_integration}{\mathrm{?}}}}$ |