$\int\left(\frac{x}{\sqrt{49+x^4}}\right)dx$
$\lim_{x\to\infty}\left(\frac{6x^4\:+2x^2+5x}{3x-3x^2+3x^4}\right)$
$2\left[3\left(160\right)-5\left(25\right)\right]$
$tg\:a+ctg\:a=\frac{1}{sen\:a\:cos\:a}$
$\frac{cot\left(x\right)}{\csc^2\left(x\right)-1}$
$3x^6-75$
$-5a-40$
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