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Q6. f(x) = 7cos2x − 24sin2xGiven that f(x) = Rcos(2x + α), where R > 0 and 0< α < 90° , (a) find the value of R and the value of α. (3) (b) Hence solve the equation 7cos2x − 24sin2x = 12.5 for 0 ≤ x < 180°, giving your answers to 1 decimal place. (5) (c) Express 14cos2x − 48sinx cosx in the form a cos2x + bsin2x + c, where a, b, and c are constants to be found. ................
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