# Differential equation

1. Nov 1, 2009

### alejandrito29

any suggestions to solve the follows differential equations by using maple???

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2. Nov 2, 2009

### kosovtsov

There are three function in your system of two ODEs. If a(t) and f(t) are unknown functions then you can proceed in Maple by following way

AN:=dsolve({ec1,ec2},{a(t),f(t)});

ans:={op(1,op(1,AN)),simplify(eval(subs(op(1,AN),op(1,op(2,AN)))),symbolic)};

odetest(ans,{ec1,ec2});

3. Nov 2, 2009

### alejandrito29

Thanks, but at last I find :
" > odetest(ans, {ec1, ec2})

Error, (in odetest) invalid input: odetest expects its 1st argument, SOL, to be of type {algebraic, =, set(=), list({=, set(=)})}, but received {o*p(1, {a(t) = -ln(2)+A(t)+2*ln(_C2)+I*Pi}), f(t) = Int(exp(1/2*A(t))*_C2/(exp(3*A(t))*_C1-2)^(1/2), t)+_C3}"

Last edited: Nov 2, 2009
4. Nov 2, 2009

### kosovtsov

Unfortunately, as I understand, there is the misprint in your (and mine) input in ans line

ans:={op(1,op(1,AN)),simplify(eval(subs(op(1,AN),o p(1,op(2,AN)))),symbolic)};