$\lim_{x\to+\infty}\left(\frac{\left(x+1\right)\cdot\left(2x-1\right)}{x^2+1}\right)$
$\left(2x+3x^3\right)\left(2x-3x^3\right)$
$\csc x\sin2x-\sec x=\cos2x\sec x$
$ex^2+x^3$
$5a\:+\:2b\:-\:3a\:+4$
$\frac{csc^2\left(x\right)-1}{tan\left(x\right)}cot^3\left(x\right)$
$2+6c+5c+9$
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