Jawabanmu

Jawaban paling cerdas!
2014-04-24T00:09:10+07:00
sec ( x - y) = sec x cec y / 1 + tan x tan y
r/x (x-y)= (r/x x r/y y) / 1+ y/x x y/x y
rx/y - ry/x= (rx/x ry/y) / 1+ y y^2/x
              = r^2 / 1 + y^3/x
               = x / 1 + y^3
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