$2\left(7n\:-\:2\right)$
$\lim_{x\to0}\left(\frac{1-\cos\left(\left(2x\right)\right)}{x^2}\right)$
$3.\left(\frac{1}{3}x^3\right)^2.1$
$\lim_{x\to\infty}\left(0.3\right)^x-1$
$-18-\left(-23\right)+45$
$-10+1^2$
$\int\left(csc^2\left(1-cotx\right)\right)dx$
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