$sen2x=74^{\circ}$
$x^2+27x=0$
$\lim_{x\to6}\left(\frac{x^2-36}{x^2-6}\right)$
$k=-10\:k\left(2+k\right)$
$\frac{2\sin\left(x\right)-1}{\sin\left(x\right)}$
$\frac{\left(4y-2\right)}{x^3-x^2-2x}\left(\frac{dx}{dy}\right)=1$
$4+2-b$
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