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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