x/O.08=cosπt/3*cosπ/6-sinπt/3*sinπ/6
y/0.06=cosπt/3*cosπ/6+sinπt/3*sinπ/6
x/O.08+y/0.06=√3*cosπt/3 ①
y/0.06-x/O.08=sinπt/3 ②
(①/√3)^2+②^2
5625x^2+10000y^2-7500xy-9=0
ω=√(k/m)
F=kx=mω^2*x
Fx=0.4*(π/3)^2*0.08cos(πt/3+π/6)
Fy=0.4*(π/3)^2*0.06cos(πt/3-π/6)
F=√(Fx^2+Fy^2)