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Provide a geometric interpretation for |z1+z2|2+|z1-z2|2=2(|z1|2+|z2|2).

Prove cisθ/(1-cisθ)=i(cis(θ/2))/(2sin(θ/2)).

Hi, I was wondering if it was possible to convert velocity as a function of time to velocity as a function of position. I know it is possible if time is made a function of position through algebraic manipulation of the position function, although this becomes extremely messy and impractical for...