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Verified answer
Perlu diketahui 1/a - 1/b = (b-a) / ab1/(x+1) - 1/(x+2)
= {(x+2)-(x+1)} / (x+1)(x+2)
= (x + 2 - x - 1) / (x+1)(x+2)
= 1 / (x+1)(x+2)