This blocks computes the output **y** as the
*tangent-inverse* of the input **u1** divided by
input **u2**:

y =atan2( u1, u2 );

u1 and u2 shall not be zero at the same time instant.
**Atan2** uses the sign of u1 and u2 in order to construct
the solution in the range -180 deg ≤ y ≤ 180 deg, whereas
block **Atan** gives a solution in the range
-90 deg ≤ y ≤ 90 deg.

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