$\frac{d}{dx}e^x+e^y=e^{x+y}$
$5\left(2-x\right)+6x<x-4$
$0,25m^3,\:0,75m^3,-\:1,2\:+\:\:1,4m^3,-\:0,8m^32,1m^3$
$\frac{cosx-cos9x}{2sin5x}=sin4x$
$5+3+12-4+1+16-11-2-7$
$\left(-13x-11\right):\left(-3\right)<\left(-6x-2\right):\left(-2\right)+3x$
$4a^2+3a=22$
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