JAMB - Mathematics (2007 - No. 11)
If y = x cos x, find dy/dx
sin x - x cos x
sin x + x cos x
cos x + x sin x
cos x - x sin x
Explanation
y = x cos x
dy/dx = 1. cos x + x (-sin x)
= cos x - x sin x
dy/dx = 1. cos x + x (-sin x)
= cos x - x sin x
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