find out what equation is this I will follow you if your answer is correct

find out what equation is this I will follow you if your answer is correct
Euler's Identity
[tex]\large {\sf e^{\pi \sqrt{-1} } = -1}\\\\\sf but\\\\\sf i^2 = -1,\\\sf i = \sqrt{-1},\\\\hence,\\\\\large {\sf e^{\pi \sqrt{-1} } = -1}\\\\\large {\sf e^{i \pi} } = -1}\\\\\large {\sf e^{i \pi} } + 1 = 0}\\\\[/tex]
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