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Hyperbolic Trig, intro, https://youtu.be/aC5cYc7XhIs
Euler's Formula, FAST, https://youtu.be/jF1Qv8KyZ1Q
complex definition of sine and cosine: https://youtu.be/CjQTWtW_x9o
This is why the area is t/2 https://youtu.be/h-gKfQkHQSA
Even and Odd part of e^x, https://youtu.be/oLZoGEcJ2YE
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