$\lim_{x\to\infty}\frac{arctanx^4}{x^7}$
$-12-\left(-16\right)-\left(-6\right)$
$63=x^2+2x$
$x^2+8x+216$
$\:-\frac{4+x}{2}=6$
$4l^2+4lx+x^2$
$\left(02x-3\right)^2$
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