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persamaan grs singgung elips di titik (3,3) :
(3-0)(x-0) / 15 + (3-1)(y-1) / 10 = 1
3x / 15 + (2y-2) / 10 = 1
x / 5 + (y-1) / 5 = 1
x+y-1 = 5
x+y = 6