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OpenStudy (lxelle):
The function f is such that f(x) = 2 sin2 x − 3 cos2 x for 0 ≤ x ≤ p. (i) Express f(x) in the form a + b cos2 x, stating the values of a and b. (ii) State the greatest and least values of f(x). (iii) Solve the equation f(x) + 1 = 0.
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