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1- cos^{2} \alpha
\frac{cos3\alpha}{cos\alpha} - \frac{sin3\alpha}{sin\alpha}
1- cos^{2} \alpha
\frac{cos3\alpha}{cos\alpha} - \frac{sin3\alpha}{sin\alpha}
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1 - Cos²α = Sin²αCos3αCosα - Sin3αSinα = Cos(3α + α) = Cos4α