$\left(7+3z\right)\cdot\left(4+3z\right)$
$\lim_{h\to0}\frac{\left(\cosh\:^2\left(x+h\right)-\cosh^2\:\left(x\right)\right)}{h}$
$\frac{dy}{dx}2x-8$
$\int_0^2\left(cos\left(\frac{\pi}{2}kt\right)\right)dx$
$x^2-4x+11$
$900+450$
$5xy-3x+4xy+2x-10+20$
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