1.Lim cos 4x sin 3x
x->0 """"""""""""" = . .
5X

2. Lim sin 7x - sin 5x
x->0 """"""""""""""=. .
8x cos 6x

ket : "" adalah garis bAgi

m0h0n bAntUanNya

soal no1
lim x--->0 cos4xsin3x/(5x)
lim x--->0 ½(2cos 4xsin 3x)/5x........(2cosa sinb=sin(a+b) - sin(a-b))
lim x--->0 ½(sin 7x - sin x)/5x
lim x--->0 ½sin 7x/5x - lim x--->0 ½sin x/5x
................½ x 7/5 - ½ x 1/5
................6/10=3/5

soal no 2
lim x-->0 sin 7x-sin 5x/(8xcos6x) ......(sin a-sin b = 2 cos½(a+b)sin½(a-b))
lim x-->0 2 cos 6x sinx/(8xcos6x)
lim x-->0 2sinx/8x
............ 2/8 = 1/4

semoga membantu
edit :(2cosasinb=sin(a+b) - sin(a-b))