Solve the equation over the interval [0, 2?). $\cos^2x - 5\cos x + 4 = 0$ ? {$\frac{\pi}{2}$} ? {$\pi$} ? {$\frac{3\pi}{2}$} ? {0}
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cosx - 5cosx + 4 = 0 Combine like terms: -4cosx + 4 = 0 Show more…
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