misalkan 0

tan b= 3/1
tan = depan / samping
sisi miring = akar (9 + 1) = akar 10
sin b = depan/ miring = 3 / akar 10 = 3 akar 10/10 (dirasinalkan)
cos b = samping miring = 1/akar 10 = akar 10/10 (dirasionalkan)

Bab Trigonometri
Matematika SMA Kelas X

tan b = 3 = 3/1 = y/x

r = √(x² + y²)
r = √(1² + 3²)
r = √(1 + 9)
r = √10

sin b = y/r
sin b = 3/√10
sin b = (3/10) √10

cos b = x/r
cos b = 1/√10
cos b = (1/10) √10