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These are questions asked by ps19


I have problem with Maple that is not simplifying equation completly:

My simplified equation:

1/u * (z - F__n1*sin(alpha__n1)*a*b*c*d + F__n2*sin(alpha__n2)*a*b*c*d + F__n3*sin(alpha__n3)*a*b*c*d)


It`s sum of F__n1*sin(alpha__n1)*a*b*c*d for example 20 elements and only n is increasing so why maple will not move a,b,c,d ahead parenthesis ?




I have problem with usage of diff function. I need to compute partial derivative over  diff(varphi__l(t),t) in that equation.

T__ln := (1/2)*(diff(varphi__l(t), t))^2+((1/2*(m))*v__l+(1/2*(I))*(diff(varphi__l(t), t))^2)+((1/2*(m))*v+(1/2*(I))*(diff(varphi__l(t), t))^2)

If I am trying to use:

diff(T__ln, diff(varphi__l(t), t))

I get the error:

Error, invalid input: diff received diff(varphi__l(t), t), which is not valid for its 2nd argument

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