$\frac{1}{sec\:t\:-1}+\frac{1}{sec\:t\:+1}=\:2cot\:t\:csc\:t$
$x^3+4x^2+3x+12$
$\frac{14mn-8m^2-2mn}{2mn}$
$2\cos\:x+\sqrt{2}=0$
$9x^3-24x^2$
$8u+6u$
$\lim_{x\to+\infty}\left(ln\left(x\right)^2-ln\left(x+2020\right)\right)$
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