Matematika

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Cos10°+cos50°+cos70°=

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  • Cos10°+cos50°+cos70°
    2Cos(30°).cos(-20°)+cos(70°)
    2 x √3/2 x cos(20°)+cos(70°)
    √3 x cos(20°) + cos(70°)
    1.96962

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