$2a+3b-5a+2b$
$-20-8-\left(-2-4\right)$
$\frac{dy}{dx}=\frac{senx}{cosy};\:y\left(0\right)=3$
$\frac{5x^2-8x-x^3-50}{x+4}$
$\left(x+4\right)\left(x+5\right)-6\ge6$
$\sqrt[2]{625}$
$20x^2+100x+125$
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