Final answer:
The question involves high school level vector mathematics, focusing on operations such as addition and subtraction of vectors, finding the magnitude and direction of vectors, and determining principal values of trigonometric functions.
Step-by-step explanation:
The question appears to be related to vector mathematics and involves finding the principal value of a trigonometric function, as well as performing operations with vectors. One example given includes θ₁ = 3.4π, principal value = -0.6π, which demonstrates finding the principal value for a given angle. In vector mathematics, we often need to determine vector magnitudes and directions. Using the provided information, we can calculate vector operations, such as vector addition (Ã + B), vector subtraction (Ã – B), and possibly work with polar coordinates or convert between coordinate systems. The magnitude and direction of the resultant vectors are given: for example, |Ã + B| = 7.211, and finding the angle of 0 = 236°.