$\frac{a-1}{a-2}-\frac{a-2}{a+3}+\frac{1}{a-1}$
$\frac{d^2}{dx^2}\left(f'''\left(x\right)=4\sqrt{x-1}\right)$
$-7s^2+2s+3$
$\ln\tan\left(1-x\right)$
$-2x-3=-x^2$
$cot\left(x\right)cos\left(-x\right)+sin\left(x\right)=-csc\left(x\right)$
$-3^2+9$
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