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Fie un triunghi abc cu ab=9cm,bc=12 cm si ac=7 cm.Sa se determine sinus B,cosinus B,tangenta B,cotangenta B.

Răspuns :

cosB = [tex] \frac{AB^2 + BC^2 - AC^2}{2AB*BC}= \frac{81+144-49}{y} = \frac{176}{216}= 0.814[/tex]
sinB = √(1-cos²B) = √(1-0.665) =√0.335=0.578
tgB = [tex] \frac{sinB}{cosB} [/tex]=[tex] \frac{0.578}{0.814} [/tex] = 0.71
ctgB = [tex] \frac{1}{0.71} [/tex] = 1.408