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90 BC

Centuries: 2nd century BC - 1st century BC - 1st century
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 Trigonometric Identities ... [/itex] $\cos(x + y) = \cos(x) \cos(y) - \sin(x) \sin(y)$ [itex]\tan(x + y) = \frac{\tan(x) + \tan(y)}{1 - ...