Chapter 3, Problem 47P

Vectors $\stackrel{\to }{A}$ and $\stackrel{\to }{B}$ lie in an xy plane. $\stackrel{\to }{A}$ has magnitude 8.00 and angle 130°; $\stackrel{\to }{B}$ has components B_x = −7.72 and B_y = −9.20. What are the angles between the negative direction of the y axis and (a) the direction of $\stackrel{\to }{A}$, (b) the direction of the product $\stackrel{\to }{A}$ × $\stackrel{\to }{B}$, and (c) the direction of $\stackrel{\to }{A}$ × ( $\stackrel{\to }{B}$ + 3.00 $\hat{k}$)?