$tan2x+1=0$
$\frac{x^4}{4}-x^3+x^2$
$-1\left|-\left(39-54-7\right)\right|-\left(4+9\right)$
$-14-7-\left(-25\right)$
$\left(4x^6\:-2y^5\right)^5$
$21+9b-4b$
$\frac{dy}{dx}=\left(2\cdot x^2+4\right)\cdot y+3\cdot x^2+6$
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