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arctan13+arctan17+arctan113+…+arctan11+n+n2+arctan1n+1= ? \arctan\frac{1}{3}+\arctan\frac{1}{7}+\arctan\frac{1}{13}+ \ldots +\arctan\frac{1}{1+n+n^{2}}\\ +\arctan\frac{1}{n+1}=\ ? arctan31+arctan71+arctan131+…+arctan1+n+n21+arctann+11= ?
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