$12-\left(6-3\right)-\left(2+7\right)$
$26+\left(6-\:3\right)\left(_{-2}\right)$
$\ln\left(\cosh\left(8x\right)-\sinh\left(8x\right)\right)$
$\int\frac{\left(1+x\right)^2}{x\left(1+x^2\right)}dx$
$3\cdot14$
$\left(3x+2\right)\left(4x-2\right)$
$5.3+5.8+6.3+5.0+6.0$
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