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Trigonometryhard
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Consider the function f(x)=cos⁡2(x)−sin⁡2(x)f(x) = \cos^2(x) - \sin^2(x)f(x)=cos2(x)−sin2(x). Which of the following describes the transformation required to map g(x)=cos⁡(x)g(x) = \cos(x)g(x)=cos(x) onto f(x)f(x)f(x)?