$5x+4x-12$
$a+\left(\left(-2a+b\right)-\left(-a+b-c\right)+a\right)$
$\left(3x-1\right)^2-\left(4x+1\right)^2$
$\int\frac{\sqrt{x^2-196}}{x}dx$
$2x^4+2x^2-4$
$\frac{3x^3-x^2-3x-1}{x+1}$
$\frac{1+\cos\left(a\right)-\sin\left(a\right)}{1+\cos\left(a\right)+\sin\left(a\right)}=\sec\left(a\right)-\tan\left(a\right)$
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