$\lim_{x\to0}\left(1+3x\right)^{\frac{1}{\left(2x\right)}}$
$sen^2=1-\left(\frac{\sqrt{3}}{5}\right)^2$
$\frac{d}{dx}\left(xe^y=x^2-y^2\right)$
$x^2-6x-720$
$\left(8a^3-b^3\right)\left(4a^2+2ab+b^2\right)$
$-2\cdot200$
$10^7\cdot2^2$
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