Question: Please help with Integrals...Can't get my heard around it

Hi guys i've read ll the "Essential Tutorials" for Maple 11, but i just can;t get my head aroudn how i can do the following Integrals in Maple 11. it keeps spitting out the exact same value i put in. i've tried diffrent ways of inputting the values but i either get it all wrong or just get the exact same input value back. i've attached the 3 questions that i need help with here : http://i81.photobucket.com/albums/j219/ke3pup/integrals.jpg can someone tell me how i can get Maple 11 to find the solution to these 3 problems attached? Please help. thank you
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