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Integrate[2 Cos[x],{x,0,Pi/2}]-Integrate[2 Cos[x],{x,Pi/2,3Pi/2}]+Integrate[2 Cos[x],{x,3Pi/2,2Pi}]
Integrate[2 Cos[x],{x,0,Pi/2}]-Integrate[2 Cos[x],{x,Pi/2,3Pi/2}]+Integrate[2 Cos[x],{x,3Pi/2,2Pi}]
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