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*1 Tópicos teóricos abordados*
• Determinante 3x3
• Seno do arco duplo
• Cosseno do arco duplo

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*2 Enunciado* Assinale a alternativa que corresponde à soma dos valores de θ ∈ [0, π] que satisfazem det A = −13.
a) π/4 b) 2π/3 c) 3π/4 d) 2π e) 4π

_Caso você tenha resolvido o problema por um caminho alternativo, não deixe de comentá-lo para assim enriquecermos a discussão_

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*3 Sugestão de problemas*

Envie uma sugestão de problema e eu a resolverei em vídeo – https://bit.ly/QED_forms

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*Informações do vídeo*

*Música* – Anthem · Emancipator

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