Răspuns:
Explicație pas cu pas:
BC²=AB²+AC²=18²×2+36×30=72√135
A) sin C=AB/BC sin C=18√2/72√135=√2/4√135
cosC=AC/BC cosC=6√30/72√135 cosC =√10/36√3
tgC=AB/AC tgC=18√2/6√30=3/√15=3√15/=√15/5
ctgC=1/tgc ctgC=√15/3
B)
sin B=AC/BC sinB=cosC=6√30/72√135=√10/36√3
cosB=sinC cosB= √2/4√135
tgB=ctgC tgB=√15/3
ctgB=tgc ctgB=√15/5