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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