int pi/4 to 2pi/4 of 0.5*sin(2x) dx + | int pi/2 to 3pi/4 of 0.5*sin(2x) dx |int pi/4 to 2pi/4 of 0.5*sin(2x) dx + | int pi/2 to 3pi/4 of 0.5*sin(2x) dx |

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