(16x^2-1)/(y^2) / (4x+1)/y^3) is equal to .....
(16x^2-1)/(y^2) * (y^3)/(4x+1) which is equal to .....
(4x-1)*(4x+1)/y^2 * (y^3)/(4x+1) which is equal to .....
y^3/y^2 * (4x-1)*(4x+1)/(4x+1).
y^3/y^2 = y
(4x+1)/(4x+1) = 1
equation becomes:
y * (4x-1) 4xy - y.
you seem to be missing a y somewhere.
to confirm, let y = a random value and x = a random value.
i chose y = 7 and x = 3
((16x^2-1)/y^2) / ((4x+1)/y^3) = 77
4xy = 84
4xy-y = 77
this is easier to see what happens on a manually derived worksheet.
here's my worksheet.
