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int_0^1 x sin(x/3) dx + int_2^3 x sin(x/3) dx + int_4^5 x sin(x/3) dx + int_6^7 x sin(x/3) dx
int_0^1 x sin(x/3) dx + int_2^3 x sin(x/3) dx + int_4^5 x sin(x/3) dx + int_6^7 x sin(x/3) dx
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