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Ive been having problems trying to understand the difference between a differential and a derivative.
the derivative of cosx = - sinx and i can proof this using the basic derivative forumula.
but how would i do the same thing to proof the differential?
Thanks
you just proved
Δ(Cosx)/Δx=-Sinx+o(Δx)
where o(Δx)/Δx->0 thus neglective
So you have proved
d(Cosx)/dx=-Sinx
According to Leibniz's definition
This can be called as
d(Cosx)=-Sinx*dx - differential form
X'(y-Xβ)=0
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