$\frac{dy}{dx}=\frac{x+xy}{y+xy}$
$\frac{\left(1-sin2x\right)}{cos2x}=\frac{\left(cosx-sinx\right)}{\left(cosx+sinx\right)}$
$cosec^2x\left(1+tan^2x\right)$
$x^2-2x+1^2$
$2c^2+4b+5c^2-3b$
$125w^{12}+5w^6$
$-4a\left(m+1\right)^2-2a^2\left(m+1\right)$
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