Trigonometry Identities: cos(x +/- y) = cos(x)cos(y) -/+ sin(x)sin(y)

First published at 18:22 UTC on May 11th, 2023.
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In this video I derive addition and subtraction identities, cos(x+y) and cos(x-y), using the Law of Cosines and the Pythagorean Theorem. This identity is very useful in all of mathematics and is used in the derivations of many trigonometric derivati…

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CategoryEducation
SensitivityNormal - Content that is suitable for ages 16 and over
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