Jawabanmu

2014-05-12T10:32:18+07:00
A.
f(x) = 6 sin x
f'(x) = 6.cos x

b.
f(x) = 2 sin x - 4 cos x
f'(x) = 2.cos x - 4.(-sin x) = 2 cos x + 4 sin x

c.
f(x) = 3 cos x - 2x² + x
f'(x) = 3.(-sin x) - 2.2.x + 1 = -3sinx - 4x + 1

d.
f(x) = sin x . cos x
f'(x) = cos x . cos x + sin x . (-sin x) = cos²x - sin²x

e.
f(x) = x² / tan x
f'(x) = (2x.tanx - x².sec²x) / tan²x = 2x.cotx - x².csc²x