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Wolfram Mathematica Online Integrator
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∫
-(x*Cos[a + x]) + Sin[a + x]

Integrate[x*Sin[a + x], x] ==
-(x*Cos[a + x]) + Sin[a + x] 

Integrate[x Sin[a + x], x] == 

-(x Cos[a + x]) + Sin[a + x]
Time to compute: 0.02 second
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