Помогите найти производную

1)  f(x)=-1/cos5x

2)  f(x)=ctg(x/3)

3)  f(x)=(x^3/3) - 2x^2 - 12x + 5                      
 
   f ' (x)= 0

4)  f(x)=sin5x*cos6x - cos5x*sin6x
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