Mathematics

Mathematics

Problem

∫(1+2x+3x2+4x3+… ) dx=\int (1 + 2x + 3x^2 + 4x^3 + \dots)\,dx = (a) (1+x)−1+c(1+x)^{-1} + c (b) (1−x)−1+c(1-x)^{-1} + c (c) (1−x)−1−1+c(1-x)^{-1} - 1 + c (d) None of these (a) (1+x)−1+c(1+x)^{-1} + c (b) (1−x)−1+c(1-x)^{-1} + c (c) (1−x)−1−1+c(1-x)^{-1} - 1 + c (d) None of these

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