Complex Hyperbolic Trigonometry Proofs: cos(iz) = cosh(z) and cosh(iz) = cos(z)

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In this video I prove some really cool identities involving the hyperbolic cosine and cosine functions. These identities relate the two in a very nice way. I hope this video helps someone:)
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Woah, that pen holding technique! This guy teaches

Manicscitzo
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Dude you like Bezos but with hair, awesome video btw!

Shoki
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Wow, how do you write while holding your hand like that

Anonymous-qqyy