∫ 4/sin^2x dx
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∫4/sin^2xdx∫4/sin^2xdx∫4/sin^2xdx∫4/sin²xdx＝4∫1/sin²xdx＝4∫csc²xdx＝-4cotx+C
∫ 4/sin^2x dx
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