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Sagot :

bonjour

dans le triangle ACB rectangle en C on a:

a)cos(CAB)=AC/AB

cos53°=7/AB

AB=7/cos(53)≈11.63

b)sin(CAB)=CB/AB

sin36°=CB/13

CB=13xsin(36)≈7.64

c)cos(CAB)=AC/AB=8/11

arccos(8/11)≈43.34°

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