Prove that cos 2θ is constructible if and only if cos θ is constructible.

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Q: 7x8(6+16÷8) Mx8x6 556164117 S= +1 EQ

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Fundamentals of Trigonometric Identities

Trigonometric Identities are the equalities that involve trigonometry functions and hold for all the values of variables given in the equation.