tentukan nilai perbandingan trigonemetri jika diketahui A. cos beta=3/10 B. sin alpa=4/15

a). cos beta = 3/10 maka
     cos beta = samping/miring = 3/10 ---> nilai depan = akar (100-9) = akar 91
     perbandingannya
     sin beta = depan/miring = akar 91/10
     tan = depan / samping = akar 91 / 3
     sec = 1/cos = 1/(3/10) = 10/3
     cosec = 1/sin = 1/(akar 91/10) = 10/akar 91 = (10 dikali akar 91) / 91
     cotangen = 1/tan = 1/(akar 91/3) = 3/akar 91 = (3 dikali akar 91) / 91

b). sin alfa = 4/15 
     sin alfa = depan / miring = 4 /15 ---> samping = akar(225-16) = akar 209
     caranya sama seperti diatas