Question on: JAMB Mathematics - 2013

If y = x sin x, find (\frac{\delta y}{\delta x})

A
sin x - cos x
B
cos x - x sin x
C
cos x + x sin x
D
sin x + x cos x
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Correct Option: D

y = x sin x

Where u = x and v = sin x

Then (\frac{\delta u}{\delta x}) = 1 and (\frac{\delta v}{\delta x}) = cos x

By the chain rule, (\frac{\delta y}{\delta x} = v\frac{\delta u}{\delta x} + u\frac{\delta v}{\delta x})

= (sin x)1 + x cos x

= sin x + x cos x

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