Question

F(x)=sin x +1/cos x-1​

Answer 1

Если я правильно поняла то
f(0)=sin(cos 1)

Answer 2

It appears that you've provided a mathematical expression:

F(x) = sin(x) + 1 / (cos(x) - 1)

This is a function of the variable x, and it combines trigonometric and algebraic components. If you have any specific questions or tasks related to this function, please let me know, and I'd be happy to assist you further.