$\lim_{x\to\infty}\left(\frac{x+\ln\left(\frac{15}{2}\right)}{x-\ln\left(\frac{15}{2}\right)}\right)^x$
$a^2-2ax+x^2.3a^2+ax-2x^2.-2a+3ax+4x^2$
$6d-4d+9d-3d+7-d$
$\lim_{x\to-\infty}\left(\frac{3^x}{3^x-2^x}\right)$
$ctg^2\:x+1$
$\int x^{-\frac{3}{7}}dx$
$n^2-6n+36$
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