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Жарты бұрыш аіңдер: а) \( \sin ^{2} 6 \alpha \); ә) \( \cos ^{2} 4 \alpha \);

Ask by Logan Washington. in Kazakhstan
Feb 18,2025

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Answer

а) \( \sin^{2} 6\alpha = \frac{1 - \cos 12\alpha}{2} \) ә) \( \cos^{2} 4\alpha = \frac{1 + \cos 8\alpha}{2} \)

Solution

Используем основные тождества приведения выражений через половинный угол:   sin²θ = ½ (1 – cos 2θ),   cos²θ = ½ (1 + cos 2θ). Таким образом: а) При θ = 6α:   sin²6α = ½ (1 – cos 12α); ә) При θ = 4α:   cos²4α = ½ (1 + cos 8α).

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Синус функциясының жарты бұрыш формуласы бойынша, \( \sin^{2}(x) = \frac{1 - \cos(2x)}{2} \) формуласын қолдануға болады. Сондықтан \( \sin^{2}(6\alpha) = \frac{1 - \cos(12\alpha)}{2} \) болып табылады. Косинус функциясының жарты бұрыш формуласы арқылы, \( \cos^{2}(x) = \frac{1 + \cos(2x)}{2} \) формуласын пайдаланамыз. Сәйкесінше, \( \cos^{2}(4\alpha) = \frac{1 + \cos(8\alpha)}{2} \) болады.

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