Jawabanmu

2014-03-21T20:55:35+07:00
Sinus=y/r
cosinus=x/r
tangen=y/x

(sin^2a - sin^2b)=(sin a - sin b)^2=(y/r a - y/r b)^2
(cos^2 a - cos^2 b)=(x/r^2 a - x/r^2 b)=(x/ra - x/rb)^2
(tan^2 a - tan^2 b)=(y/x^2 a - y/x b)= (y/xa - y/x b)^2


(y/r a - y/r b)^2 / (x/r a - x/r b)^2 =(y/x a - y/x b)^2

(y/r a - y/r b)^2
------------------=  (y/x a - y/x b)^2 (r dihilangkan)
(x/r a - x/r b)^2

(y a - y b)^2      (y a - y b)^2
-----------------=  --------------------
(x a - x b)^2      (x a - x b)^2