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If sin (x + 20^(@)) = 2 sin x cos 40^(@)...

If `sin (x + 20^(@)) = 2 sin x cos 40^(@), ` where `x in (0.pi //2),` then which of the following hold (s) good?

A

`cos 2x = 1//2`

B

`cos ec 4 x =2`

C

`sec ""x/2 = sqrt6 -sqrt2`

D

`tan ""x/2 =(2- sqrt3)`

Text Solution

Verified by Experts

The correct Answer is:
A, D
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