Trigonometry: Power-Reducing Formulas
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|sin^2 u = ?||sin^2 u = (1 - cos 2u) / 2|
|cos^2 u = ?||cos^2 u = (1 + cos 2u) / 2|
|tan^2 u = ?||tan^2 u = (1 - cos 2u) / (1 + cos 2u)|
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