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If text f left( text x right) = sin left text...

This question belongs to Engineering Maths Calculus
Calculus
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If \[{\text{f}}\left( {\text{x}} \right) = \sin \left| {\text{x}} \right|\]   then value of \[\frac{{{\text{df}}}}{{{\text{dx}}}}\] at \[{\text{x}} = \frac{{ - \pi }}{4}\]  is

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Correct Answer: Option C
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