1008 syms r(t) theta(t) m g L
1009 L = 2*m*diff(r)^2
1010 L = 2*m*diff(r)^2 + m/2*r^2*diff(theta)^2-g*r*m(3-cos(theta))
1011 L = 2*m*diff(r)^2 + m/2*r^2*diff(theta)^2-g*r*m(3-(theta))
1012 L = 2*m*diff(r)^2 + m/2*r^2*diff(theta)^2- g*r*m*(3-cos(theta))
1013 L
1014 man diff
1015 help diff
1016 diff(L, theta)
1017 diff(L)
1018 diff(L, theta)
1019 theta
1020 diff(L, theta, t)
1021 diff(L, theta)
1022 diff(L, t, theta)
1023 who
1024 L
1025 diff(L, theta, r, theta)
1026 L
1027 L = 2*m*diff(r)^2 + m/2*r^2*diff(theta)^2- g*r*m*(3-cos(theta))
1028 clear
1029 syms m g theta r L
1030 syms t
1031 theta = sym('theta(t)')
1032 r = sym('r(t)')
1033 L = 2*m*diff(r,t)^2 + m/2*r^2*diff(theta,t)^2- g*r*m*(3-cos(theta,t))
1034 diff(diff(L,diff(theta)),t)
1035 diff(diff(L,diff(theta)),t)
1036 diff(diff(L,diff(theta)),t) - diff(L, theta)
1037 diff(diff(L,diff(theta,t)),t) - diff(L, theta)
1038 simplify(diff(diff(L,diff(theta,t)),t) - diff(L, theta))
1039 diff(L,diff(theta,t))
1040 diff(L,theta)
1041 diff(diff(L,diff(theta,t)),t)
1042 sym('diff(diff(L,diff(theta,t)),t) = 0'
1043 )
1044 sym('diff(diff(L,diff(theta,t)),t) = 0')
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