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∫(0->t0) t√(2+t^2) dt
=(1/2)∫(0->t0) √(2+t^2) d(2+t^2)
=(1/3)[ (2+t^2)^(3/2) ]|(0->t0)
=(1/3) [ (2+t0^2)^(3/2) - 2^(3/2) ]
=(1/2)∫(0->t0) √(2+t^2) d(2+t^2)
=(1/3)[ (2+t^2)^(3/2) ]|(0->t0)
=(1/3) [ (2+t0^2)^(3/2) - 2^(3/2) ]
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