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    Proof of Cos2x Equation

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    December 12, 2023

    Based on ABC triangle with hypotenuse 1 unit, we can prove the equation of cos2x = 2.cosx² - 1 = cosx² - sinx² = 1 – 2.sinx² as follows.


    Proof_of_Cos2x_Equation

    Based on ABC triangle with hypotenuse 1 unit, we can prove the equation of cos2x = 2.cosx² - 1 = cosx² - sinx² = 1 – 2.sinx² as follows.

    Proof_of_Cos2x_Equation


    Proof_of_Cos2x_Equation


    Proof_of_Cos2x_Equation


    Proof_of_Cos2x_Equation


    Proof_of_Cos2x_Equation


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    Proof of Cos2x Equation - Bylge