Find the acceleration of $B$.
Find the acceleration of $B$.
- A
$\frac{a \sin \alpha_1}{\cos \alpha_2}$
- B
$\frac{\operatorname{acos} \alpha_1}{\cos \alpha_2}$
- C
$\frac{ a \cos \alpha_2}{\cos \alpha_1}$
- D
$\frac{\cos \alpha_1}{\cos \alpha_2}$
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