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Prove that (i) " 2sin " (5pi)/(12) "...

Prove that
`(i) " 2sin " (5pi)/(12) " sin " (pi)/(12)=(1)/(2)`
`(ii) " 2 cos " (5pi)/(12) " cos " .(pi)/(12)=(1)/(2)`
`(iii) " 2 sin ".(5pi)/(12) " cos " (pi)/(2) = ((2+sqrt(3))/(2))`

A

`(2+ sqrt3)/(2)`

B

`(2-sqrt3)/(2)`

C

`(1)/(2)`

D

`3/2`

Text Solution

Verified by Experts

The correct Answer is:
A
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