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Ajutatima va rog urgent

Ajutatima Va Rog Urgent class=

Răspuns :

cosA/sinA=(AB/AC)/(BC/AC)=(AB/AC)x(AC/BC)=AB/BC=15/9=5/3
ctgA=cosA/sinA=5/3
cosC/sinC=(BC/AC)/(AB/AC)=(BC/AC)x(AC/AB)=BC/AB=9/15=3/5
ctgC=cosC/sinC=3/5