Differentiate the functions given in w.r.t. x.

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Let y = u + v
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Taking log on both sides, we get
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⇒log u = x.cos x.log x
Now, differentiate both sides with respect to x
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Taking log on both sides, we get

⇒ log v = log (x2 + 1) – log (x2 – 1)
Now, differentiate both sides with respect to x
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Because, y = u + v
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