$\lim_{x\to0}\left(\left(0.1a^x+0.9b^x\right)^{\frac{1}{x}}\right)$
$=\frac{1}{-2x^2-6x-4}$
$\int\frac{1}{x\left(0.4x+2\right)}dx$
$49y^6-112x^3y^3+64x^6$
$\frac{3}{2\:}x+1>2x-\frac{4}{3}$
$89^4t+29^3t^2-69^2t^4$
$4u^5\left(-12u+6u+7\right)$
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