Is there a way to prove Euler’s Identity without using trigonometry?


  • M0 M2 M3

    Is there a way to prove Euler’s Identity, \(e^{πi} + 1 = 0\), without using trigonometry?


  • MOD

    Hi @RZ923!

    To begin with, Euler’s Identity (\(e^{i\pi}+1=0\)) is directly related to complex numbers - a topic that is much broader than just trigonometry. These two topics are connected and can be used almost everywhere! The simplest and most common interpretation of complex numbers is a geometric one: vectors in a coordinate system. This interpretation is directly connected with trigonometry: its general form is Euler's formula: \(e^{ix}=\text{cos }x + i\cdot\text{sin }x\) (Euler’s Identity is Euler's formula for \(x=\pi\)).

    Euler’s Identity is not just a simple, short, and nice identity that comes from nowhere - it is a huge topic that covers lots of beautiful and interesting information and takes years to find out. Everything is connected here, with trigonometry especially. 🙂


  • M0 M2 M3

    @nastya Thanks 🙂


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