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∫[2:+∞]dx/(x²+3x-4)
=(1/5)∫[2:+∞][1/(x-1) -1/(x+4)]dx
=(1/5)ln[(x-1)/(x+4)]|[2:+∞]
=(1/5)ln[1- 5/(x+4)]|[2:+∞]
=(1/5){ln[1- 5/(2+4)]-ln1}
=(1/5)[ln(1/6)-0]
=(-1/5)ln6
=(1/5)∫[2:+∞][1/(x-1) -1/(x+4)]dx
=(1/5)ln[(x-1)/(x+4)]|[2:+∞]
=(1/5)ln[1- 5/(x+4)]|[2:+∞]
=(1/5){ln[1- 5/(2+4)]-ln1}
=(1/5)[ln(1/6)-0]
=(-1/5)ln6
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