UnitQuaternionIsEquivalent Method 
Name  Description  

IsEquivalent(UnitQuaternion) 
Indicates whether another instance of this type is mathematically equivalent to this instance.
Instances are equivalent if each coordinate value of one instance is equal to the corresponding coordinate value of the other instance,
or if each coordinate value of one instance is the opposite of the corresponding coordinate value of the other instance.
 
IsEquivalent(UnitQuaternion, Double) 
Indicates whether another instance of this type is mathematically equivalent to this instance, within the required tolerance.
Instances are equivalent if each coordinate value of one instance is equal to the corresponding coordinate value of the other instance,
or if each coordinate value of one instance is the opposite of the corresponding coordinate value of the other instance.
