$\int8\cdot\cos\left(-8x\right)dx$
$1-2\cdot3^2$
$\frac{6x^2-14x-27}{\left(x+2\right)\left(x-3\right)^2}$
$3x+4y-z;\:x=-1;\:y=-1;\:z=2$
$18cm^2\cdot2cm$
$36y^2+120y-100$
$a^2+2x+1=0$
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