## 15 Reputation

4 years, 141 days

## How the Integral can be solved?...

Maple 2020

Hi friends

Could you please give hints to solve the integral

int(exp(I*k*x)*sech(x),x=-infinity..infinity)

Thanks

## Coefficients of a multivariable polynomi...

Maple

Hi dears

Just a simple question: I am trying to restore the coefficients of a polynomial in a vector, respect to a list of variables. For example

f:=a*u[]*u[1]*u[2]+b*u[1]*u[2]+c*v[]*v[1]*u[2]+d*u[]*v[1]*v[2]+d*u[]*v[1]*u[2]+f*u[]*v[];
f := a u[] u[1] u[2] + c u[2] v[] v[1] + d u[] u[2] v[1] + d u[] v[1] v[2] + b u[1] u[2]+fu[]v[]
collect(f,{u[1],u[2],v[1],v[2]},distributed);
(a u[] + b) u[1] u[2] + (c v[] + d u[]) u[2] v[1] + d u[] v[1] v[2]+fu[]v[]

in above example I intend to keep (a u[] + b) and (c v[] + d u[]) and d and fu[]v[] in a vector or a varieble. Is there any comments?

## solve and dsolve commands...

Maple 2019

I am newcommer in Maple. I am using Maple 2019. Just a simple question;

solve(x^2-3*x+4=0, x);

gives

1.50000000000000 + (9.09238836013723*10^(-59))*I, 1.50000000000000 - (9.09238836013723*10^(-59))*I

instead I need to show in the forms of radiacal. I have also the problem in dsolve command;

dsolve(2*diff(y(x),x\$2)+3*diff(y(x),x)+4*y(x),y(x));

with the result

y(x) = (2.73949338633639*10^(-116) + (2.73949338633639*10^(-116))*I)*_C1 + (1. + (2.73949338633639*10^(-116))*I)*_C2