Question: nonlinear system of equation

hello guys,
in the bellow, screen shot that I have sent to you.
how can I solve this three equations and obtain a1 a2 a3??? in fact non zero answers.
also is this possible to learn me how to write my codes that I have written in maple in the form that others send to you for their questions??? I dont know how to do that...and send screen shot!!
thank you

Please Wait...