Question 13.P.9: Assuming that Guyan’s reduction gives acceptable accuracy, o...

\begin{aligned}&u_{1}=0.1667-0.1679 \cos 9.71 t+0.0012 \cos 27.55 t \text { in. } \\&u_{2}=0.3333-0.3357 \cos 9.71 t+0.0024 \cos 27.55 t \text { in. } \\&u_{3}=0.4000-0.3999 \cos 9.71 t-0.0001 \cos 27.55 t \text { in. } \\&u_{4}=0.5000-0.4962 \cos 9.71 t-0.0038 \cos 27.55 t \text { in. }\end{aligned}