Hello
 

I have problem that Maple is not evaluating integral (I need equation for distance for Lissajous curve):

restart;
with(Physics);
with(LinearAlgebra);
with(IntegrationTools);

x := A*sin(a*t + d);
y := B*sin(b*t);

u := diff(x, t);
u2 := diff(y, t);
u3 := sqrt(u^2 + u2^2);

u5 := int(u3, t);

I am only getting:

Hello

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

My simplified equation:

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

Hello,

I have problem with usage of diff function. I need to compute partial derivative over   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