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B
4x
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C
2x
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D
3x
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Solution
The correct option is C2x Given x=tanh−1y tanhx=y=ex−e−xex+e−x=sinhxcoshx ∴1+y=2exex+e−x - 1 1−y=2e−xex+e−x - 2 divide 1 by 2, 1+y1−y=e2x ln(1+y1−y)=lne2x=2x