sin x - cos x
cos x - x sin x
cos x + x sin x
sin x + x cos x
Correct answer is D
y = x sin x
Where u = x and v = sin x
Then δuδx = 1 and δvδx = cos x
By the chain rule, δyδx=vδuδx+uδvδx
= (sin x)1 + x cos x
= sin x + x cos x
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