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Trigonometria no triângulo retângulo
Quero confirmar se meu calculo está correto pois não bate com o do livro, referente a questão: Qual o cosseno dos ângulos C, E e G, sabendo que seus senos são respectivamente raiz de 15 sobre 8, três sobre cinco e 5 raiz de 41 sobre 41? Os resultados do livro são: cos C = sete sobre oito, cos E = quatro sobre 5 e cos G = quatro raiz de 41 sobre 41
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