Page 52 - Math Grade 12 (Basic)

PROEUS DARA

cosx
~f:'lff12 f'(x) = lim
h-0
-2
= lim
h ->() .

. -sm- h
2 .
-h-sm
= hm l
h -> () 2
= -1 x sinx = -sinx

tlmsg f'(x) = -sinx '1
u

du ""
tf:'lff12 - = 2x 2h = cosu
dx du
dy = dy x du = 2x x cosu = 2xcos 3)
dx du dx
tlLH28 y' = 2xcos - 3) '1
u

£'ij
"" y = Sil1X nn g y' = COSX
""
t'tJ y = COSX b S1 g y' -sin X

"" m y = sinu tst& =
""
my= cosu u:m y' =

2
n. f(x) = sinx-xcosx 2. = cos x + xsinx '1

n. f(x) = sinx-xcosx ttllru + v)' = + v'

=u'v+v'u

tf:'lff12 f'(x) = cosx- cosx+ cosx)'] = cosx-(cosx-xsinx) = xsinx