we know that for any(adsbygoogle = window.adsbygoogle || []).push({}); (x, y)in Cartesian system, there is such(r, θ)in Polar system, so

x = r * cosθand

y = r * sinθ

how you can calculate what corresponds to(Δx, Δy)in polar system?

how come?Δx * Δy = r * Δr * Δθ

Maybe this is very stupid question and has obvious answer, but I haven't been practicing higher math since the university (8 years since graduation), but now I need this proof to prove that for normal distribution the sum of all probabilities in (-∞; ∞) equals to 1.

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# Cartesian and Polar coordinate system increments

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