[" 9.The range of "f(x)=cos2x-sin2x" con...

[" 9.The range of "f(x)=cos2x-sin2x" contains the "],[" set "],[[" (a) "[2,4]," (b) "[-1,1]],[" (c) "[-2,2]," (d) "[-4,4]]]

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