F (x)=-1/cos5x туынды

[latex]y=- \frac{1}{\cos5x}\\\\ f'(x)=(- \frac{1}{\cos5x})'= -\frac{1'\cdot\cos5x-1\cdot(\cos5x)'}{(\cos5x)^2}=- \frac{5\sin5x}{\cos^25x} [/latex]