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Mathematics, 11.02.2021 19:40 lacourboud20005

Soit ijk un triangle rectangle en K. Soit x la valeur en degrès de l'angle jik. 1. Exprimer la longueur jk en fonction de x et de la longueur ij. Justifier. 2. Exprimer la longueur ki en fonction de x et de la longueur ij. Justifier. 3. En déduire, à l'aide du théorème adéquat, que pour tout x, (cos x au carré) + (sin x au carré) = 1.

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Soit ijk un triangle rectangle en K. Soit x la valeur en degrès de l'angle jik. 1. Exprimer la longu...
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