Wie unterscheidet man `1 + cos ^ 2 (x)`?

`"differentiate using the "color(blue)"chain rule"`

`"given "y=f(g(x))" then"`

`dy/dx=f'(g(x))xxg'(x)larrcolor(blue)"chain rule"`

`y=1+(cosx)^2`

`dy/dx=2cosx xxd/dx(cosx)`

`color(white)(dy/dx)=-2sinxcosx=-sin2x`