A simpler demo of Euler’s formula

Following on from yesterday I found the following at:
http://www.proofwiki.org/wiki/Euler’s_Formula

Differentiate \displaystyle\frac{\cos\theta + i\sin\theta}{e^{i\theta}} to get zero. Then put \theta=0 to show that the constant value of \displaystyle\frac{\cos\theta + i\sin\theta}{e^{i\theta}} must be 1.

That’s it!

 

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