$\frac{10x^3-8x^2+25x-1}{5x^2}$
$\left(2xy+x^2+y^2-z^2\right)\left(2xy-x^2-y^2+z^2\right)$
$6=-1\left(x-8\right)$
$\frac{1}{2}a^3b-2a^2b^2+\frac{1}{3}ab^3+4;\:a=2;\:y\:b=-1$
$\cot\left(x\right)\left(\csc\left(x\right)-\cot\left(x\right)\right)=\frac{\cos\left(x\right)}{1+\cos\left(x\right)}$
$\left(14m^2-4m-20\right)-\left(2m+4\right)$
$29.8-10.1$
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