So, with 4.7 it doesn't work either.
But if I do some transformation by hand, and square both sides (I'm
not completely sure if that's allowed), then I get the solution.
f_2 = ((1/4*a^2*t^4 + a_x*t^3*v_x + a_x*t^2*x + t^2*v_x^2 +
t^2*v_y^2 + 2*t*v_x*x + 2*t*v_y*y + x^2 + y^2 -m)/(t^3*v_y +
t^2
Normally solve(e == m, a_x, to_poly_solve='force') works, but interestingly,
not for your equation.
Joal Heagney
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Btw. I use sage 4.6.2. I wasn't aware that 4.7 allready exists.
I will try out if the issue still exists in 4.7.
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