$\int_{-3}^31+xdx$
$-9\:-\left\{5-2-\left[4+3-\left(7+6-9\right)+5\right]\right\}-4$
$\int^61\left(x^2+4x-2\right)dx$
$3\cos\left(x+30'\right)=\:2.121$
$\frac{3}{8}xy^2-02xy^2$
$\int\frac{1}{x^2e^{\frac{1}{x}}}dx$
$\int\frac{x^2+2x-1}{x^2+9}dx$
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