$\lim_{x\to3}\left(x+2\right)sin\left(\frac{1}{x-3}\right)$

$\left(3\right)\left(4\right)-\left(4+5\right)$

$\int\frac{2x^2-3x+2}{\left(x+1\right)^3}dx$

$\lim_{x\to+\infty}\left(\frac{\sin\:\left(\frac{1}{x^2}\right)}{e^{\frac{1}{x^2}}-1}\right)$

$\lim_{x\to-3}\left(x-1\right)$

$\left(3a^2b^3+5y^2\right)\left(3a^2b^3-5y^2\right)$

$207^2$