B1=1,43201508410^-7

C1=7,14285714310^-7

C3=9,08760451010^-7

All these parameters are variables because they are composed of more detailed parameters with the specific conditions. This is only one case.

For parameters A2 and B2 can be four cases:

1) A2=0 and B2=0

2) A2=0,001946449287 and B2=20

3) A2=0,001946449287  and B2=0

4) A2=0 and B2=20

Spelling 'Dsolve' and aw (I wrote 'and') - I know - this is my spelling error.

What do you mean - I do not understand the do-loop?

I find a lot spelling errors in my question! Sorry.

Once again 3 equations (without a tan(x)!)

eqa1:=A1*(diff(Tg(x),x,x))+A2*(diff(Tg(x),x)+(A3+A4)*Tg(x)+A3*Tz(x)+A4*Tw(x)=0;

eqa2:= B1*(diff(Tw(x),x,x))+B2*(diff(Tw(x),x)+(B3+B4)*Tw(x)+B3*Tz(x)+B4*Tg(x)=0;

eqa3:= C1*(diff(Tz(x),x,x))+(C3+C4)*Tz(x)+C3*Tg(x)+C4*Tw(x)=0;

Values ​​az = c1, aw = (1-c1-c2), ag = c2.

rhs (op (6, res (m)) = Tz

rhs (op (2, res (m)) = Tg

rhs (op (4, res (m)) = Tw

Thank You.

B1=1,43201508410^-7

C1=7,14285714310^-7

C3=9,08760451010^-7

All these parameters are variables because they are composed of more detailed parameters with the specific conditions. This is only one case.

For parameters A2 and B2 can be four cases:

1) A2=0 and B2=0

2) A2=0,001946449287 and B2=20

3) A2=0,001946449287  and B2=0

4) A2=0 and B2=20

Spelling 'Dsolve' and aw (I wrote 'and') - I know - this is my spelling error.

What do you mean - I do not understand the do-loop?

I find a lot spelling errors in my question! Sorry.

Once again 3 equations (without a tan(x)!)

eqa1:=A1*(diff(Tg(x),x,x))+A2*(diff(Tg(x),x)+(A3+A4)*Tg(x)+A3*Tz(x)+A4*Tw(x)=0;

eqa2:= B1*(diff(Tw(x),x,x))+B2*(diff(Tw(x),x)+(B3+B4)*Tw(x)+B3*Tz(x)+B4*Tg(x)=0;

eqa3:= C1*(diff(Tz(x),x,x))+(C3+C4)*Tz(x)+C3*Tg(x)+C4*Tw(x)=0;

Values ​​az = c1, aw = (1-c1-c2), ag = c2.

rhs (op (6, res (m)) = Tz

rhs (op (2, res (m)) = Tg

rhs (op (4, res (m)) = Tw

Thank You.

Thank you very much for your help Preben Alsholm 5865 :)

Thank you very much for your help.