Question: Using the formal definition of a derivative, i . e . d f d x - = lim x 0 f ( x + x

Using the formal definition of a derivative, i.e.
dfdx-=limx0f(x+x)-f(x)x
prove that if f=cosx the derivative is dfdx=-sinx
Using the formal definition of a derivative, i.e. dfdx-=limx0f(x+x)-f(x)x prove that

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