$\lim_{x\to\infty}\left(\frac{e^x-1}{2+\frac{1}{x}}\right)$
$x^3\cdot x^4.x$
$2x+5y+3x+2y+6z-4x-7z+3x+2z+5y$
$\tan\left(b\right)+\frac{\cos\left(b\right)}{1-\sin\left(b\right)}=\frac{\cos\left(b\right)}{1-\sin^2\left(b\right)}$
$4x^2-12=132$
$5x-4<39$
$10+\left(-12\right)+\left(4\right)\left(-1\right)\left(3\right)$
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