$e^4sen3x\cdot cos3x$
$\left(4x-4\right)\cdot\left(-2\right)$
$y=\left(-x\right)^2+2\cdot\left(-x\right)+1$
$\:7x\:-\:210\:=\:14\:$
$\lim x\to0\left(\frac{1-\cos\left(x\right)}{x^2}\right)$
$36x^2-72x+8a$
$2.5mn^2-0.9mn^2+0.45mn^2$
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