nilai maksimum fungsi f(x)=3cos (x-15°)-2...

Agar maksimum:
Y'=0
-3sin(x-15)=0
Sin (x-15)=0
Sin(x-15)=0
Sin(x-15)=sin 0
X=15

Y=3 cos (15-15) -2
=3 cos 0-2
=3(1)-2
=1