Mathematics · Trigonometry

If cot 4 Φ - cot 2 Φ = 1, then the value of cos 4 Φ + cos 2 Φ is:

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If cot 4 &Phi; - cot 2 &Phi; = 1, then the value of cos 4 &Phi; + cos 2 &Phi; is: