Question

f(x)= - 1/cos5x   найти производную?

f(x)=ctgx производная??
f(x)=sin5xcos6x-cos5xsin6x   производная? 

Answer 1

f(x)= - 1/cos5x
f'(x)=((0*cos5x)+(-1*(-sin5x))) *5= 5sin5x
 
f(x)=ctgx
f'(x)= -1/sin^2x

 f(x)=sin5xcos6x-cos5xsin6x=sin(5x-6x)=-sinx
 f'(x)=-cosx