Thank you very much.

Thank you very much.

With your code, perhaps add command coordinates(M). Can  Markiyan Hirnyk post your proceduce? Thank you. 

With your code, perhaps add command coordinates(M). Can  Markiyan Hirnyk post your proceduce? Thank you. 

Based on the graph, we find the minimum value of the function is approximately -4.57, not minimize command (minimize(h(x),x=-Pi/12..5*Pi/12,location);). That mean, minimize command is not correct? Please explain it to me. Thank you very much.