$\frac{dy}{dx}=\frac{x+4}{9\left(x+3\right)^2}$
$sin^2x-sinx=2$
$4ax^6-7ax^3y^2+25a^2y^4$
$21-14b$
$10\left(3y+1\right)-8=6\left(2y+5\right)-8\left(y-3\right)$
$2.61\:\cdot\:\left(-1.7\right)$
$40b^2m+30b^2-20bm$
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