$7y^2-41y+30$
$ln\left(x^2\left(1-x\right)^{\frac{1}{2}}\right)$
$\left(50-c\right)^2-10.5^2$
$\left(-11\right)\left(+7\right)\left(+8\right)$
$sin\:2x\:=\:cos^2x$
$\frac{-c}{a}+\frac{b^2}{4a^2}$
$3k+8-2k=14$
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