Evaluate
-\frac{\left(x^{2}+y^{2}+z^{2}\right)^{6}}{2}-\frac{6\left(x^{2}+y^{2}+z^{2}\right)^{3}}{5}
Expand
-10\left(xy\right)^{6}-10\left(xz\right)^{6}-10\left(yz\right)^{6}-45\left(xyz\right)^{4}-15\left(xy\right)^{2}z^{8}-15\left(xz\right)^{2}y^{8}-15\left(yz\right)^{2}x^{8}-30x^{2}y^{4}z^{6}-30x^{2}z^{4}y^{6}-30y^{2}x^{4}z^{6}-30y^{2}z^{4}x^{6}-30z^{2}x^{4}y^{6}-30z^{2}y^{4}x^{6}-\frac{15x^{4}y^{8}}{2}-\frac{15x^{4}z^{8}}{2}-\frac{15y^{4}x^{8}}{2}-\frac{15y^{4}z^{8}}{2}-\frac{15z^{4}x^{8}}{2}-\frac{15z^{4}y^{8}}{2}-3x^{2}y^{10}-3x^{2}z^{10}-3y^{2}x^{10}-3y^{2}z^{10}-3z^{2}x^{10}-3z^{2}y^{10}-\frac{x^{12}}{2}-\frac{y^{12}}{2}-\frac{z^{12}}{2}-\frac{36\left(xyz\right)^{2}}{5}-\frac{18x^{2}y^{4}}{5}-\frac{18x^{2}z^{4}}{5}-\frac{18y^{2}x^{4}}{5}-\frac{18y^{2}z^{4}}{5}-\frac{18z^{2}x^{4}}{5}-\frac{18z^{2}y^{4}}{5}-\frac{6x^{6}}{5}-\frac{6y^{6}}{5}-\frac{6z^{6}}{5}
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