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[" If "int(sin((pi)/(4)-x))/(2+sin2x)dx=...

[" If "int(sin((pi)/(4)-x))/(2+sin2x)dx=A tan^(-1)(f(x))+B,f(0)=1," where "A,B" are constants,then the range "],[" of "A.f(x)" is "],[[" 1) "[-1,1]," 2"[-sqrt(2),sqrt(2)]," 3) "[0,1]," 4) "[-sqrt(2),0]]]

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