ok, i was doing my hw and i just do not have a clue how to solve this.
the problem is:
(2x^3-x)cos(1-x^2)
and this is what i got or attempted so far. i'm not even sure if this is the right way. can somebody tell me where i went wrong?
[d/dx(2x^3-x)cos)1-x^2) x (2x^3-x)[d/dx(cos(1-x^2))]
=(6x^2-1)cos(1-x^2) x 2x(2x^3-x)sin(1-x^2)
thanks much!