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If y=(sin^4x-cos^4x+sin^2xcos^2x)/(sin^4...

If `y=(sin^4x-cos^4x+sin^2xcos^2x)/(sin^4x+cos^4x+sin^2xcos^2x),x in (0,pi/2)` , then (a)`-3/2lt=ylt=1/2` (b) `1lt=ylt=1/2` (c)`-5/3lt=ylt=1` (d) none of these

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