$\left(12m^2x^2-a\right)^2$
$\frac{54x^2x^2z^3}{-6xy^2z^3}$
$\frac{10}{x^2+4x-21}$
$\int_0^{\frac{\pi}{6}}\left(cos^{-9}2sen\:2x\right)dx$
$5x^2y-8xy^2-9y^3;\:x=2;\:y=-1$
$\left(3x^2-8x-5\right)-\left(3x^2-12x-2\right)$
$x^2+16x+9$
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