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oh yes, sorry, I'm wrong, today I've worked on and I found this nonlinear system > sys:={D2 t2 Cos[(l t2)/2] == C2 t2 Sin[(l t2)/2], B1 + (3 D1 l^2)/4 + (l^3 q)/(48 B) == B3 + D3 t3 Cos[l t3], D2 t2 == B3 + D3 t3...