Express \( \cos^4 A \) in multiple angles.
University of Ilorin MTH101 salang past question
- \(\frac{3 + 4\cos 2A + \cos 4A}{8}\)
- \(\frac{1 + 2\cos 2A + \cos 4A}{4}\)
- \(\frac{1 + \cos 4A}{2}\)
- \(\frac{3 + \cos 4A}{4}\)
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