Cascade Rise Time ...?? How to proof...??

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harisyuana

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Hi, there...

I have a difficult problem from my college...

How to proof cascade rise time on scope mathematically...??
We know that the formula for cascade rise time combination is ..

tr = √ta²+tb²

How to proof it theoritically...??
Please help me...

I have search in google, but it use central limit theorm and too complicated.
My teacher said it can be proof by phasor.

How...??
I have no idea

Thank
 

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