$7x+21x^2$
$\lim_{x\to0}ln\left(\frac{3x+1}{x^2+2x}\right)$
$-\left(\sqrt{y+2}\right)^2$
$5x-2y=4$
$2\left(2x^{2n}\right)\left(1\right)$
$12x^2-72xy+108y^2$
$\lim_{x\to0}\left(\left(sen\left(x\right)\right)^{\frac{1}{x}}\right)$
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