1.

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

Answer»

`COS 2X =1//2`
`cosec 4x =2`
`SEC ""x/2 = sqrt6 - sqrt2`
`tan ""x/2 = (2- sqrt3)`

ANSWER :A::B::D


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