$\left(xy^2+xy\right)dx+\left(x^2y-y\right)dy=0$
$\int-7\arcsin\left(3\cdot x\right)dx$
$2\cos\left(2x\right)\cos\left(x\right)-\cos\left(3x\right)$
$\left(\frac{3y^5}{y}\right)^2$
$m^2-8m+25$
$\int\left(\frac{5}{25x^2+1}\right)dx$
$a=\left(2x+3\right)^{2}-\left(2x-3\right)^{2}+\left(3x-4\right)^{2}-8x^{2}-16$
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