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[" 42."(sin^(3)theta-cos^(3)theta)/(sin theta-cos theta)-(cos theta)/(sqrt(1+cot^(2)theta))-2tan theta cot theta=-1" if "],[[" A) "theta in(0,(pi)/(2))," B) "theta in((pi)/(2),pi)," C) "theta in(pi,(3 pi)/(2))," D) "theta in((3 pi)/(2),2 pi]]

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