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9.3 Double-angle, half-angle, and reduction formulas  (Page 6/8)

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  • Card 6 / 8:
    double-angle formulas

    identities derived from the sum formulas for sine, cosine, and tangent in which the angles are equal

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Source:  OpenStax, Algebra and trigonometry. OpenStax CNX. Nov 14, 2016 Download for free at https://legacy.cnx.org/content/col11758/1.6
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