Question: Problem with solve


I am new to Maple (Version 17) and got some trouble with the solve command:


Trouble with solve

The Problem is, that Maple does not find a solution, allthrough there is one :-)

If i put a:=Pi/4 before the first commad, I get one solution, but i want to find the solution in dependence of 'a'.

Also i tried to remove the last equation (a>0), then maple gives: a solution, but say a<0, which is incorrect, because there are solutions for instance for a=Pi/4 :-(

I dont know, whats wrong there, so pleeaase help :-)

Greets from Germany and sorry for my English, i hope you can understand :-)

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