$\frac{4x^2-1}{2x+1}$
$x-2x-6x-1+2\left(x-6x+4\right)-\left(2x-2x-2\right)$
$\ln\left(10x+5\right)=\ln\left(x-5\right)$
$x+2\sqrt{3x^2}-2x-8$
$x=cosy$
$-12569-8425$
$\csc\left(\frac{2}{x-2}\right)-\frac{\left(x+6\right)\sqrt{4x-x^{2}}}{2}$
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