@Rouben Rostamian  

I'm new student with Maple so i maybe faced some programmer peoplem and trying to solve it by myself and people how help me like you, appreciate your help

Thank you ms. Rouben

@Rouben Rostamian  

haha it's really homework, and it's vary easy to solve by hand but on Mable i don't know how to do after trying several time

Here is the solution by hand