**Input:** A complex number $x = a + bi$.

**Goal:** Return the modulus of this number, $|x|$.

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  <summary><b>Need a hint?</b></summary>

  A video explanation of absolute value and complex numbers can be found [here](https://www.youtube.com/watch?v=FwuPXchH2rA).

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> Q# function `AbsComplex` from `Std.Math` namespace gets the absolute value of a complex number. For educational purposes, try to do this task by hand.
