$\frac{12}{4x}+\frac{12}{x}=1$
$4x^2-37x-30=0$
$\sqrt{x}+3\:\sqrt{x}-3$
$\int_{-\infty}^{\ln2}e^{2x}dx$
$\frac{\left(x^2+2xy-1\right)}{xy^2+3};\:x=-1;\:y=3$
$-x-y+3z=-1$
$\cos\alpha\cdot sen2\alpha=sen\alpha$
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