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Trigonometria no triângulo retângulo
Num triângulo retângulo ABC, de ângulos internos Â, B e C, com C=90?, de lados AB=c, AC=b e BC=a, calcule o valor numérico de M=(a-b)/a*cotg (Â/2)-b*cotg (B/2). Motivo da pergunta: não to conseguindo fazer de jeito nenhum. Já procurei a resolução na Internet e ñ achei,essa questão caiu na minha prova ontem e estou sem gabarito.
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