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In triunghiul ABC,m(

Răspuns :

AC²= BC² - AB²
AC²=225-81
AC²=144
AC= 12
sinB= BC/AC
sinB=15/12
cosB= BC/AB
cosB= 15/9
tgC= AB/AC
tgC= 9/12
ctgC=AC/AB 
ctgC= 12/9