$12a+24b-20c$
$\left(-21\right)-\left(-35\right)+\left(-60\right)$
$x\:-32^2+\:9x^2$
$\lim_{x\to0}\left(\sin\left(2x\right)\sin\left(x\right)-\cos\left(x\right)\right)$
$\lim_{x\to0}\left(\frac{5x}{\tan\left(x\right)}\right)$
$\int3\:\tan\left(3x\right)dx$
$\int x\cdot\cos\left(5\right)x\:dx$
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