a) AB=12, AC=16, BC=20 (folosind teorema lui Pitagora), sinB=AC/BC=16/20=4/5, sinC=AB/BC=12/20=3/5, cosB=AB/BC=3/5, cosC=AC/BC=4/5, tgB=AC/AB=16/12=4/3, tgC=AB/AC=12/16=3/4
ctgB=AB/AC=3/4
ctgC=AC/AB=4/3
b)AB=18, BC=30, AC=24 (folosind teorema lui Pitagora), sinB=AC/BC=24/30=4/5
sinC=AB/BC=18/30=3/5
cosB=AB/BC=3/5
cosC=AC/BC=4/5
tgB=AC/AB=24/18=4/3
tgC=AB/AC=18/24=3/4
ctgB=AB/AC=18/24=3/4
ctgC=AC/AB=24/18=4/3
Astea sunt primele doua subpuncte ca sa ai ca exemplu. Sper ca te-am ajutat. Scrie-mi daca mai ai nevoie!