For given systen ${\theta _2}$ ....... $^o$
For given systen ${\theta _2}$ ....... $^o$
- A
$30^o$
- B
$45^o$
- C
$60^o$
- D
${\tan ^{ - 1}}\left( {\frac{1}{2}} \right)$
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- [IIT 2020]
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