If sin(x+20^0)=2sinxcos40^0,w h r ex in ...

If `sin(x+20^0)=2sinxcos40^0,w h r ex in (0,pi/2),` then which of the following hold(s) good? `cos2x=1/2` (b) `cos e c4x=2` `secx/2=sqrt(6)-sqrt(2)` (d) `tanx/2=(2-sqrt(3))`

`"sec"(x)/(2)=sqrt(6)-sqrt(2)`

`"cot"(x)/(2)=2+sqrt(3)`

`tan 4x=sqrt(3)`

`"cosec"4x=2`

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