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

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

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