$\frac{900}{1}.\frac{9}{15}$
$\frac{1}{2}\cdot\sin\left(x\right)+1-\cos^2\left(x\right)=0$
$\frac{2}{4+4x}$
$5\left(2x-6\right)-30$
$2x+5\cdot10+9$
$x+2+x+4$
$\frac{dy}{dx}-6x=0$
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