$2a+3a+a$
$15m\ge90$
$x^2\frac{dy}{dx}+\frac{1}{y^2}=0;\:y\left(1\right)=2$
$\int\:\frac{x^2+6x+4}{x^4+8x^2+16}dx$
$4x^2-5y-6z\:+\:\:4x^2-5y-6z\:\:+\:4x^2-5y-6z\:\:+\:\:4x^2-5y-6z$
$\frac{1}{2cos^2x-1}$
$\left(yx^3+15\right)\left(4x^3+5\right)$
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