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If sin(x+20^0)=2sinxcos40^0,where in (0,...

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

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If sin(x+20^0)=2sinxcos40^0,where in (0,pi/2), then which of the following hold(s) good? (a) cos2x=1/2 (b) cos e c4x=2 (c) sec(x/2)=sqrt(6)-sqrt(2) (d) tan(x/2)=(2-sqrt(3))

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