2008
Mathematics
JAMB
Differentiate sin x - x cos x
A.
x cos x
B.
x sin x
C.
-x cos x
D.
-x sin x
Correct Answer: x sin x
Explanation
sin x - x cos x dy/dx = cos x - [1.cos x + x -sin x] = co x - [cos x - x sin x] = cos x - cos x + x sin x = x sin x
sin x - x cos x dy/dx = cos x - [1.cos x + x -sin x] = co x - [cos x - x sin x] = cos x - cos x + x sin x = x sin xTHIS WEEK's
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