$x^4y'-2x^3y=x^6sec2xtan2x$
$\lim_{x\to\infty}\left(\frac{-x^2-12x-7}{3ln\left(x^5\right)}\right)$
$\lim_{x\to\infty}\left(\frac{ln10^x}{4^x}\right)$
$cos^2x-cos2x=1$
$0,4\:+\:5\cdot0,01$
$6a^2b^2-15a^3b^3c+12a^4b^3c^2$
$ex x^{-x^2}$
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