Let, y = x3 ex cos x
We have to find dy/dx
As we can observe that y is a product of three functions say u, v & w where,
u = x3
v = cos x
w = ex
∴ y = uvw
As we know that to find the derivative of product of three function we apply product rule of differentiation.
By product rule, we have –
∴ from equation 1, we can find dy/dx