$\left(\tan+\cot\right)^2$
$\lim_{x\to\infty}\left(\sqrt{\frac{3x^2-2x^6+5x-3}{-4x^3+2-4x^2-x}}\right)$
$3x^2+6x-9=0$
$\frac{x}{2}-4=20$
$\frac{t}{1-t^3}$
$sin\left(x-30\right)$
$\left(-2\right)-\left(_{-5}\right)$
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