mandrin
![[Graphics:HTMLFiles/sweetspotplane_12_1.gif]](Images/sweetspotplane_12_1.gif)
![ Equations = {1/2 g L1 m1 Cos[ψ1[t]] + 1/(4 L2) (g M (-π^2 Cos[(π p1[ ... Sin[(π p1[t] + 2 π p2[t] + L2 χ[t])/L2] ψ1^′′[t])))))) == Q4b} ;](Images/sweetspotplane_12_2.gif)
