$\lim_{x\to-\infty}\:\frac{5^x}{3^x+2^x}$
$2a^2+a=15$
$3a\left(1+2a+3a^4\right)$
$3cosx=2senxcosx$
$x^2=3x+4$
$y'-4xy=2x$
$\lim_{x\to1}\left(\frac{\sqrt[3]{2-x}-2}{1-\sqrt[6]{2-x}}\right)$
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