Mathematics · Trigonometry

यदि cot 4 Φ - cot 2 Φ = 1 है, तो cos 4 Φ + cos 2 Φ का मान क्या है?

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यदि cot 4 &Phi; - cot 2 &Phi; = 1 है, तो cos 4 &Phi; + cos 2 &Phi; का मान क्या है?