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حل المعادلة التربيعية \( 3x^2 - 12x + 9 = 0 \). - AMAZONAWS
حل المعادلة التربيعية \( 3x^2 - 12x + 9 = 0 \). - AMAZONAWS
📅 March 11, 2026
👤 scraface
Mar 11, 2026
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📌 Use identity: \( \cos(2\theta) = 1 - 2\sin^2\theta = 1 - 2\left(\frac{3}{5}\right)^2 = 1 - 2\cdot\frac{9}{25}