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[" 1.If "int(cos^(4)x)/(sin^(2)x)dx=A co...

[" 1.If "int(cos^(4)x)/(sin^(2)x)dx=A cot x+B sin2x+C(x)/(2)+D" ,"],[[" 1) "B=-2," 2) "B=-3/2],[" 3) "B=-1/4," 4) "B=-1]]

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