If y x cos x find dy dx - JAMB Mathematics 2007 Question
If y = x cos x, find dy/dx
A
sin x - x cos x
B
sin x + x cos x
C
cos x + x sin x
D
cos x - x sin x
correct option: d
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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