$f\left(x\right)=\frac{\left(0.99\right)^2-1}{\left(0.98\right)-1}$
$a^2\sin\left(90\right)+2ab\cos\left(0\right)-b^2\sin\left(270\right)$
$\frac{x-20}{x^2-4x}+\frac{x}{x-4}$
$7-3\cdot1$
$\int m^{12}dm$
$x^2-2x-63$
$x^2-9x-28$
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