Carilah f' (x) dari fungsi - fungsi di bawah ini . a. f(x) = sin^2 x b. f(x) = cos^2 x c. f(x) = 6 sin x + 2 cos x d. f(x) = 2 cot x
Ghinashodaa. f(x) = sin^2 x = (sin x)² f ' (x) = 2sinxcosx = sin2x b. f(x) = cos^2 x = (cosx)² f '(x)= 2cosx(-sinx) = -2sinxcosx = - sin2x c. f(x) = 6 sin x + 2 cos x f . (x) = 6cosx - 2sinx d. f(x) = 2 cot x = 2cosx sinx f ' (x) =-2sinxsinx - 2cosxcosx sin²x = -2(sin²x + cos²x) sin²x = -2/sin²x = -2 cosec x
= (sin x)²
f ' (x) = 2sinxcosx
= sin2x
b. f(x) = cos^2 x
= (cosx)²
f '(x)= 2cosx(-sinx)
= -2sinxcosx
= - sin2x
c. f(x) = 6 sin x + 2 cos x
f . (x) = 6cosx - 2sinx
d. f(x) = 2 cot x
= 2cosx
sinx
f ' (x) =-2sinxsinx - 2cosxcosx
sin²x
= -2(sin²x + cos²x)
sin²x
= -2/sin²x
= -2 cosec x