$x^2-8x=7$
$\lim_{x\to0}\left(1+\left(\sin\left(2x\right)\right)^2\right)^{\frac{3}{x^2}}$
$1^{18}-9^2$
$\int16x\cdot sen\left(4x\right)dx$
$\left(x^2+x+2<x^2+1\right)$
$\frac{1}{x^3\sqrt{x^2-11}}$
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