
William W. answered 09/29/20
Experienced Tutor and Retired Engineer
d(sin(x))/dx = cos(x)
d^2(sin(x)/dx^2 = -sin(x)
d^3(sin(x)/dx^3) = -cos(x)
d^4(sin(x)/dx^4) = sin(x)
So derivatives divisible by 4 will result in the same as the original. Since 108 is divisible by 4, it will result in sin(x), two more derivatives after that results in -sin(x)
Ely G.
Thank you so much!10/01/20