$y^2-y=x^2-y$
$4x^2+28x+49\le0$
$4\cdot2-18\cdot2-40$
$\frac{x^2+15x+11}{x-1}>5$
$12x-7<18x-9$
$\left(-8549\right)+5023$
$\frac{\frac{1}{\sin\left(x\right)}-\sin\left(x\right)}{\cos\left(x\right)}$
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