$\left(x+5\right)\left(x-5\right)-25+6x^2$
$\frac{1}{4}-\frac{1}{4}\cos\left(2x\right)^2$
$\lim x->\infty\left(\sqrt{x^2+2x+2}-\sqrt{x^2-2x+2}\right)$
$20+90+51\left|d\right|$
$\int\frac{2x}{\left(x+3\right)^2}dx$
$\sqrt{1692}$
$\int x^4\sqrt{8x^5-8}dx$
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