If $sin t + cos t = \frac{1}{5}$ then $tan \frac{t}{2}$ is equal to :
If $sin t + cos t = \frac{1}{5}$ then $tan \frac{t}{2}$ is equal to :
- A
$-1$
- B
$-\frac{1}{3}$
- C
$2$
- D
Both $(b)$ and $(c)$
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- [JEE MAIN 2020]