Como podemos ajudar? # gunank312

• gunank312 criou uma publicação,

When one is using khan academy, it is conceived to be in “elementary” level or something, if there is to be more content on the related topics, for example, some trigonometric proofs are not “legit...

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• gunank312 criou uma publicação,

### linear approximation of a rational function

hello, i have question on : https://www.khanacademy.org/video/linear-approximation-example?qa_expand_key=ag5zfmtoYW4tYWNhZGVteXI_CxIIVXNlckRhdGEiHGthaWRfNTE0MDMyNDAyODgyNDMwNTM3NzY2MzYMCxIIRmVlZGJh...

• gunank312 criou uma publicação,

### product rule, squeeze theorom

hello, in the calculus topic, in proving the product rule, at 1:46, why is (f(x)g(x))=(f(x+h)g(x+h)-f(x)g(x))/h? i am a little confused here, as wouldn't the "equation" change, as its not exactly a...

• gunank312 comentou,

I got my doubt clarified, denominator to becomes x plus delta x minus x giving delta x... Thanks

• gunank312 criou uma publicação,

### Question in a video

For the proof of derivative of ln(x) is 1/x, at 00:40, why is the denominator simply delta x and not x?