$-6+3\left(-3+5\right)-2$
$\int x.\sqrt{2x+a}dx$
$x^2-15x+6.25$
$\sec^4x\tan^3$
$\frac{sin\left(2x\right)}{1+sin^2\left(x\right)}$
$\lim_{x\to8}\left(x^2+4\right)$
$\left(423\:\cdot\left(214\:+\:15\right)\right)$
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