$12-2020$
$\sin\left(\frac{\pi}{2}\right)x$
$\frac{\sec\left(\frac{x}{2}\right)}{\csc\left(\frac{x}{2}\right)}$
$\frac{x^3-a^3}{x+a}$
$\lim_{x\to\infty}\left(\frac{e^{6x}}{\sqrt{x}}\right)$
$5+3x<4-x$
$-15\:+\:-25\:+\:-35\:+-45\:+-55$
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