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maka
f(x) = 2 . 2.sinx.cosx
f(x) = 2. sin 2x
jadi
f'(x) = 2 cos 2x . (2x)'
= 2. cos 2x . 2
= 4 . cos 2x
maka
f ''(x) = 4. (-sin 2x) . (2x)'
= - 4.2 sin 2x
= -8 sin 2x
= -8. 2 . sin x . cos x
= -16 sinx. cosx
Jadi turunan kleduanya yaitu f ''(x) = -16 sinx. cosx