$\frac{2x^2-9x+-18}{18x^3+18}$
$7cos^2x-9=-9sinx$
$\lim_{x\to0}\left(\frac{sen\left(a+h\right)-sena}{h}\right)$
$100+34.567+0.4$
$\frac{dz}{da}=-ab$
$\sqrt[4]{-256x^{32}y^0}$
$a^2+6a+9=0$
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