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Question

If y=|sinx||x|, then the value of dydx at x=π6.

A
26π6[6log23x]
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B
2π6[6log2+3x]
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C
26π6[6log2+3x]
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D
None of the above
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Solution

The correct option is B 26π6[6log23x]
Given y=|sinx||x|
In the neighbourhood of π6,|x| and |sinx| both are negative
i.e., y=(sinx)x
Taking log on both sides, we get
logy=xlog(sinx)
1ydydx=(x)1sinx(cosx)+log(sinx)(1)
=xcotxlog(sinx)
=[xcotx+log(sinx)]
dydx=y[xcotx+log(sinx)]
Therefore, (dydx)x=π6=(2)π6[6log23π]6.

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