If a = 13, b = 14, c = 15, then `cos("A"/2)` = ______. - Vidyadip

MCQ

If a = 13, b = 14, c = 15, then `cos("A"/2)` = ______.

✓
`2/sqrt(5)`
B
`1/2`
C
`1/5`
D
`1/sqrt(5)`

✓

Answer

Correct option: A.

`2/sqrt(5)`

A

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