$\left(2a+b+c\right)^2$
$\frac{2csc2x}{cscx}$
$xy'\:+\:3y\:=\:3x^2+4$
$2\left(2\right)^{2}-5\left(2\right)\left(1\right)+4\left(1\right)^{2}$
$-1>3+\frac{k}{8}$
$3,78\:+\:0,3$
$\left(z-3\right).\left(z+5\right)$
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