$\left(a-b\right)\left(2a+3b\right)-c\:\left(-4a+5b\right)$
$3a^2+8a-16$
$-2-3+4+8+5$
$\sin^3\left(x\right)+\left(\sin\left(2x\right)\right)\left(\cos\left(x\right)\right)=\tan\left(x\right)$
$\lim\:_{x\to\:\infty\:}\left(\frac{\left(4x\right)cos\left(2x\right)-sen\left(2x\right)}{4\left(x^3\right)}\right)$
$\cos\left(\frac{\pi}{6}+\frac{\pi}{4}\right)$
$\:\:\:\left(\frac{x}{5}+\frac{y}{7}\right)\left(\frac{x}{5}-\frac{y}{7}\right)$
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