$\left(-7+4\right)\left(-5-1\right)-1$
$81w^2-49$
$\int_0^{\frac{\pi}{4}}\frac{2senxcosx}{\sqrt{\left(cosx\right)^2+4\:}}dx$
$\frac{x^6+x^3-2x^2+3}{x^2-2}$
$y+3axy+3axy+z$
$\left(2a+5b\right)\left(4a^2-10ab+25b^2\right)$
$\int\frac{1}{\sqrt{9+4x^2}}dx$
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