$\frac{1}{\cos\:\left(y\right)}y'\:=3x$
$\left(x+\sqrt{-1}\right)^4+\left(x-\sqrt{-1}\right)^4$
$18z^3+200z-120$
$4\left(-6x-4\right)-6=8+6x$
$a=5,\:\:b=6,\:\:c=-10\:\:\:a+\frac{b}{2}$
$-11\times-9$
$f\left(x\right)=\left(3+2x\right)e^{-3x}$
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