Question: Simplification of expression with Maple

 I am haunted by an equation which I could simplify it with hand and it equals to −i (complexe number). But, I don't know how to use maplesoft to simplify it. The equation takes the form of:



I could simplify this equation with hand calculation and it equals to -i (the complexe number). I'am sorry for not clarifying that the a, k, Ω and m are positive variables.

Thank you in advance for taking a look.
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