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[" 1) "126],[" If "y=(sin^(4)x-cos^(4)x+...

[" 1) "126],[" If "y=(sin^(4)x-cos^(4)x+sin^(2)x cos^(2)x)/(sin^(4)x+cos^(4)x+sin^(2)x cos^(2)x),x in[0,(pi)/(2)]" then "],[[" 1) "(-3)/(2)<=y<=(1)/(2)," 2) "1<=y<=(1)/(2)," 3) "(-5)/(3)<=y<=1," 4) none of these "]]

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