$\lim_{x\to\infty}\frac{157}{\:1+5.4e^{-0.12x}}$
$a^2+b^2+c^2=2$
$\int\arccos ydy$
$10y-2\left(3-2y\right)=4y+10+2y$
$x^2\:-\left(-2\right)^2$
$\cos^2x+3\sin^2x-3$
$\frac{1}{-x}-xcos$
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