$16m^2-88mu+121u^2$
$2x^2+5x+4=0$
$\int4^{-x}dx$
$\left(x-2\right)^2=7$
$\left(3m+2n\right)\left(3m+2n\right)$
$15\cdot4800$
$f\left(x\right)=x^2+10x+21$
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