Recent content by mat145

  1. M

    For which value of a does int e^(ax) cos(x) dx converge?

    I understand the b to infinity part but I do not understand the expression evaluated at 0 part. Mathieu
  2. M

    For which value of a does int e^(ax) cos(x) dx converge?

    ok the integral is: (((a cos(x))/((a^2)+1)) + (sin(x)/((a^2)+1))) e^ax but how do I calculate the limit? Mathieu
  3. M

    For which value of a does int e^(ax) cos(x) dx converge?

    It depends if it's a type 1 or 2. For type 1 you must calculate the integral by replacing the infinity by a variable and then calculate the limit using this variable. For type 2 with a discontinuity you must split the integral in two parts and then calculate the integral using the same way than...
  4. M

    For which value of a does int e^(ax) cos(x) dx converge?

    Homework Statement For which value the definite integral (0 to infinity) e^ax cos(x) dx converges? Calculate for the value of a. Mathieu