Complex number 1!

Algebra Level 5

If x=2+5ix = 2+5i and 2(11!9!+13!7!)+15!5!=2ab!\large 2(\frac{1}{1!9!} +\frac{1}{3!7!}) + \frac{1}{5!5!} = \frac{2^a}{b!} , then the value of (x35x2+33x19)(x^3 -5x^2 +33x -19) is equal to

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