GCE A-Level Further Mathematics Practice Questions - Cameroon General Certificate Of Education Advanced Level Further Mathematics (0775) Exam

Using De Moivre's theorem, express $\cos(4\theta)$ entirely in terms of powers of $\cos\theta$.

4\cos^4\theta - 4\cos^2\theta + 1 8\cos^4\theta - 8\cos^2\theta + 1 8\cos^4\theta - 6\cos^2\theta + 1 16\cos^4\theta - 12\cos^2\theta + 1

Correct Answer:

8\cos^4\theta - 8\cos^2\theta + 1

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