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Dari definisi turunan di x,<br />

f '( x ) =<br />

Contoh 8.2.5<br />

lim<br />

h→0<br />

= lim<br />

h→0<br />

= lim<br />

h→0<br />

= lim<br />

h→0<br />

f( x+ h) − f( x)<br />

h<br />

ux ( + h) ux ( )<br />

−<br />

vx ( + h) vx ( )<br />

h<br />

ux ( + hvx ) ( ) − uxvx ( ) ( + h)<br />

hv( x + h) v( x)<br />

ux ( + hvx ) ( ) − uxvx ( ) ( ) + uxvx ( ) ( ) − uxvx ( ) ( + h)<br />

hv( x + h) v( x)<br />

⎛ux ( + h) − ux ( ) vx ( ) ux ( ) vx ( + h) −vx<br />

( ) ⎞<br />

f '( x ) = lim ⎜ ⋅ − ⋅<br />

⎟<br />

h→0<br />

⎝ h v( x+ h) v( x) v( x+ h) v( x) h ⎠<br />

Tentukan y ' untuk<br />

Penyelesaian:<br />

y<br />

vx ( ) ux ( )<br />

u '( x) − v'( x)<br />

v ( x) v ( x)<br />

= 2 2<br />

u'( x) v( x) − u( x) v'( x)<br />

= 2<br />

v ( x)<br />

2<br />

2x + 5x−6 y = 2 .<br />

x + 4<br />

2<br />

2x + 5x−6 2 2<br />

= 2 ⇒<br />

x<br />

+ 4<br />

u = 2x + 5x −6→ u'= 4x+ 5<br />

2<br />

v = x + 4 → v'= 2x<br />

uv ' − uv'<br />

y ' = 2<br />

v<br />

=<br />

=<br />

=<br />

2 2<br />

(4x+ 5)( x + 4) − (2x + 5x−6)(2 x)<br />

2 2<br />

( x + 4)<br />

3 2 2 2<br />

4x + 5x + 16x+ 20 − 4 x 10x + 12x<br />

2<br />

− 5x + 28x+ 20<br />

2 2<br />

( x + 4)<br />

2 2<br />

( x + 4)<br />

BAB VIII ~ Turunan 277<br />

W<br />

W

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