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Question: Can't solve an integral

Question:Can't solve an integral

pooyan1990 35 Maple 2019
integration
October 29 2019
1

Maple can't solve the following symbolic integration for me and it remains in the state of evaluating when I use simplify and nothing happens after hours.. any solution? 

I was thinking maybe there is something wrong with my maple !!?

 
> 

eq0:=R__i=(1/2)*d+L__1;
eq00:=R__f=c+(1/2)*d+L__1;
eq39:=R(beta)=R__i+2*beta*(R__f-R__i)/Pi;
eq39a:=simplify(subs([eq0,eq00], eq39));
eq38:=R__max(theta,beta)=R__max(theta,0)*(R(beta)/R__i);
eq41:=R__max(theta,0)=((2*L__1*cos(theta)) + sqrt(d^2 - 2*(L__1)^2 + 2*(L__1)^2*cos(2*theta)))/2;
eq38a:= simplify(subs([eq41,eq39a,eq0], eq38));

R__i = L__1+(1/2)*d

  

R__f = c+(1/2)*d+L__1

  

R(beta) = R__i+2*beta*(R__f-R__i)/Pi

  

R(beta) = L__1+(1/2)*d+2*beta*c/Pi

  

R__max(theta, beta) = R__max(theta, 0)*R(beta)/R__i

  

R__max(theta, 0) = L__1*cos(theta)+(1/2)*(d^2-2*L__1^2+2*L__1^2*cos(2*theta))^(1/2)

  

R__max(theta, beta) = (1/2)*(2*L__1*cos(theta)+(d^2-2*L__1^2+2*L__1^2*cos(2*theta))^(1/2))*(2*L__1*Pi+Pi*d+4*beta*c)/(Pi*(2*L__1+d))

 (1)
> 

eq44 := v__m(beta) = 1/int((1 - r^2/R__max(theta, beta)^2)*r, [r = 0 .. R__max(theta, beta), theta = 0 .. 2*Pi]);

v__m(beta) = 4/(int(R__max(theta, beta)^2, theta = 0 .. 2*Pi))

 (2)
> 

eq44a:=simplify(subs(eq38a,eq44));
> 

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