Lim 4x+3x cos 4x÷sin 4x cos 4x X-0

=4x/sin4xcos4x+3xcos4x/sin4xcos4x
=1/cos4x+3/4
disamakan penyebut
=4/4cos4x+3cos4x/4cos4x
=7/4
maaf ya kalau masih salah..

Lim (4x + 3x cos 4x) / (sin 4x cos 4x)
x=>0

Lim x (4 + 3 cos 4x) / (sin 4x cos 4x)
x=>0

Lim x/(sin 4x) . (4 + 3 cos 4x)/(cos 4x)
x=>0

= 1/4 . (4 + 3 cos 4(0)) / (cos 4(0))
= 1/4 . (4 + 3 (1)) / 1
= 1/4 . (7)
= 7/4