Calculate the derivative of f (x) = cos x using the definition of the derivative.?

The reason f(a) equals 0 is because when you substitute x = a into the definition f(x) = (x - a)g(x) then the term in brackets becomes a - a which is 0.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.