$\int\left(\frac{7}{16+9r^2}\right)dr$
$\frac{d}{dx}\left(-\left(x^2+3x+1\right)^4\right)$
$3x+3y=65$
$3\cos\left(x+30'\right)=\:2.121$
$60xy^2+9x^2$
$10x+6y-5x$
$-2\cos\left(x\right)=\sin\left(2x\right)-\cos\left(x\right)$
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