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Question

If x=tanh1y, then (1+y1y)=

A
ex
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B
e4x
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C
e2x
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D
e3x
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Solution

The correct option is C e2x
x=tanh1y
tanx=y=e+xexex+ex[sinhycoshy=e+xexex+ex]
1+y=2exex+ex
1y=2exex+ex
1+y1y=e2x
ln(1+y1y)=lne2x=2x

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