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? asked in Science & MathematicsMathematics · 2 years ago

Use a double-angle formula to rewrite the expression. 6 cos^2x – 3?

3 Answers

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  • ?
    Lv 7
    2 years ago
    Favorite Answer

    6 cos^2(x) - 3

    = 3(2 cos^2(x) - 1)

    = 3(cos^2(x) - sin^2(x))

    = 3 cos(2x). Final.

  • Como
    Lv 7
    2 years ago

    :

    cos 2x = 2 cos²x - 1

    6 cos ²x - 3 = 3 cos 2x

  • ?
    Lv 7
    2 years ago

    cos^2 x = (1+cos 2x)/2

    So cos^2x – 3 = ( 1 + cos 2x)/2 - 3

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