Let \( a \) and \( b \) be two given perpendicular vectors,
\( \mat...
Let \( a \) and \( b \) be two given perpendicular vectors,
\( \mathrm{P} \) which are non-zero. A vectors \( r \) satisfying the
W equation \( r \times b=a, r \) can be
(1) \( b-\frac{a \times b}{|b|^{2}} \)
(2) \( 2 b-\frac{(a \times b)}{|b|^{2}} \)
(3) \( |a| b-\frac{a \times b}{|b|^{2}} \)
(4) \( |b| b-\frac{(a \times b)}{|b|^{2}} \)
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