$\lim_{x\to-\infty}\frac{1+2\cos\left(\frac{\pi}{6}x\right)}{x}$
$500+\left(-2\right)$
$6tan^2-5tanx-25$
$10\infty6$
$\csc^4\left(2x\right)-9=0$
$y=\frac{x}{a}+\frac{a}{x}$
$\lim_{x\to0}\left(\frac{2x+1-\cos\left(x\right)^2}{\sin\left(x\right)}\right)$
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