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x + C
We know that 0 1 = x / | 1 dx / / 0 = | x . dx / / 0 = | x . 1 dx /
(Here f(x) is x and 0 is its power, derivative of x is 1 which is also exist in front of x. So apply the rule take its power with plus 1 as power and divide by new power.)
0 + 1 x = ------- + C 0 + 1 1 x = ----- + C 1 = x + C