x+1x(1−x)
3x−1x(1−x)
3x+1x(1−x)
x+1x(1−x)
Correct answer is D
21−x−1x = 2x−1(1−x)x(1−x)
= 2x−1(1+x)x(1−x)
= 3x−1x(1−x)
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