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[" If "f(x)=int cot^(4)xdx+(1)/(3)cot^(3...

[" If "f(x)=int cot^(4)xdx+(1)/(3)cot^(3)x-cot x" and "f(pi/2)=pi/2," then "f(x)=],[[" (A) "(pi)/(2)-x," (B) "x-pi," (C) "pi-x," (D) "x]]

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