diketahui segitiga siku di c, jika sin a=s\c maka nilai tanah b

sin a = depan/miring = BC/AB = s/c

samping^2= miring^2 - depan^2
samping^2= c^2 - s^2
samping = akar (c^2 - s^2)

tan b = depan/samping = s^2/akar (c^2 - s^2)