turunan cos (2 ln x) ?

u = 2 lnx
dy/dx = d(cosu)/du . d(2 lnx)/dx
= -sinu . (2/x)
= -(2/x) sin(2 ln(x))

u = 2lnx
dy/dx = d(cosu)/du , d( 2 lnx)/dx
= -sinu . ( 2/x)
= -( 2/x). sin( 2in(x) )