Question: Maple not simplifies equation completly

Hello

I have problem with Maple that is not simplifying equation completly:

My simplified equation:

1/u * (z - F__n1*sin(alpha__n1)*a*b*c*d + F__n2*sin(alpha__n2)*a*b*c*d + F__n3*sin(alpha__n3)*a*b*c*d)

 

It`s sum of F__n1*sin(alpha__n1)*a*b*c*d for example 20 elements and only n is increasing so why maple will not move a,b,c,d ahead parenthesis ?

 

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