$\left(260-x\right)^2$
$\tan\left(x\right)\left(\csc^2\left(x\right)-1\right)$
$m^2+19m+70$
$\left(a-c\right)^2;\:a=-1;\:b=2;\:c=-\frac{1}{2}$
$\frac{x}{-x+5}=0$
$2a^2+a=1$
$\frac{4x^3+5x^2-6x+7}{x+4}$
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