Here's a visual proof that sin2x = 2sinxcosx cos2x = cos²x−sin²x pic.twitter.com/vC9jVTsZT1 — Fermat's Library (@fermatslibrary) October 31, 2020
Here's a visual proof that sin2x = 2sinxcosx cos2x = cos²x−sin²x pic.twitter.com/vC9jVTsZT1
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