Network
E. 9
penyelesaian :
ingat rumus 1 - cos^2ax = sin^2ax
lim 1-cosax
x->0 _________ 1/2 a^2
x^2
lim cosax - 1
x->0 ________ = -1/2 a^2
x^2
masukan ke soal:
lim 2(1-cos^23x)
x->0 ___________
cos2x - 1
= 2.3^2
________
-1/2.2^2
= 18
____
-2
= -9
