A) 0
B) 2/3
C) 3/5
D) ¾
Correct Answer: D
Solution :
[d] \[\vec{a}\times (\vec{a}\times \vec{b})=\vec{c}\Rightarrow \overrightarrow{\left| a \right|}\left| \vec{a}\times \vec{b} \right|=\overrightarrow{\left| c \right|}\] \[(\therefore \vec{a}\bot (\vec{a}\times \vec{b}))\] \[1(1\times 5)sin\theta =3\Rightarrow sin\theta =\frac{3}{5}\Rightarrow \tan \theta =\frac{3}{4}\]You need to login to perform this action.
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