Mathematical formula

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\scriptstyle\left(3n+1\right)^2=\left(\left(10\sdot\left[\frac{1}{3}\sdot\left(3n\right)\right)^2\right)-\left[\frac{1}{3}\sdot\left(3n\right)\right]^2\right]+3n+\left[\left(3n+1\right)\right] no such category found: mathematical formula