$\left(3a+5b\right)^2-\left(3a-5b\right)^2$
$\lim_{x\to\infty}\left(\frac{x^2+2}{x}\right)$
$2.1-1.4$
$x^2+x+30=0$
$\int\left(x\right)\sqrt{3x+8}dx$
$1^{-4.5}$
$\int_2^4\left(\frac{x^2+\sqrt{x}-7}{\sqrt[5]{x}}\right)dx$
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