$x^2\:y^3\:z+y^2\:z^2$
$\frac{\sen\alpha}{1+\cos\alpha}+\frac{\sen\alpha}{1-\cos\alpha}=\frac{2}{\sen\alpha}$
$-5.8k\:-\:2\:+\:0.5k$
$\log_{x+3}\left(6\right)$
$\frac{dp}{dt}=\frac{1+3t^2}{3p\left(p-2\right)}$
$6x^2+12x+-13=0$
$62-971$
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