Use \int \cos(x)\mathrm{d}x=\sin(x) from the table of common integrals to obtain the result.

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.