$\lim_{x\to\infty}\left(\tan\left(\frac{\pi x}{2x+1}\right)\right)^{\frac{1}{x}}$
$=3\cos x-5\cot x$
$2\frac{1}{4}x^3\left(-\frac{6}{7}y^5\right)$
$f+15=-16$
$\left(1100-135\right)+\left(680-75\right)+\left(800-120\right)+267$
$8a^2+6$
$\frac{-52abc}{-4ab}$
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