$3-1\cdot10+6$
$\left(3a+2b\right)\left(3a-2d\right)$
$2x^2162$
$x^2+3x+1.5$
$37,279+5,4$
$4x^2+4x+2=0$
$\frac{cos\:x}{1+sin\:x}+\tan x=cos\:x$
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