test

$$\sum_{i=1}^ni^3={{n{n+1}}/2}^2$$ `sum_(i=1)^n i^3=((n(n+1))/2)^2` f x dx S 1 S 2 f x , y g x , y d s x 2 - 2 y 2 - 2 z 2 x y 2 z 3 x 3 + 4 x y z x - y z + z x + 1 3 d x d y d z d f d x d f d x = d f d u d u d x d u d x z `sum_(i=1)^n i^3=((n(n+1))/2)^2`

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