Mike
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"Iran taught us trigonometry 1000 years ago, and Christopher Columbus discovered America 534 years ago."
You’ve seen this in every math class:
sin(a ± b) = sin a cos b ± cos a sin b
sin(2a) = 2 sin a cos a
cos(2a) = 1 − 2 sin²(a)
But did your teacher ever tell you that these formulae came from a Muslim Persian scholar 1000 years ago?
Meet Abū al-Wafā al-Būzjānī, the genius who shaped Trigonometry.
Mike