$\left(4\sin\left(x\right)\cos\left(x\right)\right)\left(2\cos^2\left(x\right)-1\right)=\sin\left(4x\right)$
$\lim_{x\to\infty}\left(\frac{2x+1}{\sqrt{\:x+\:x^2}}\right)$
$\left(+3\right)+\left(-4\right)-\left(+2\right)-\left(-1\right)$
$12-x<6+x$
$\lim_{x\to4}\left(\frac{x^2-16}{4-x}\right)$
$\int3x^4e^{-2x}dx$
$46r+44+17r+13-24$
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