$\int\frac{1}{\sqrt{-x^2-4x}}dx$
$5+\left[3-\left(12+4-1\right)+6\right]-11-\left(2+7\right)$
$5^{y+1}=2^{3x}$
$acx^2+\left(ad+bc\right)yx+bdy^2$
$\frac{sec^2x-1}{tanx}=tanx$
$4x^2-\:2x<2$
$\int15x^4\left(3x^5-2\right)^5dx$
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