If 2a=2tan10^(@)+tan50^(@), 2b=tan20^(@)...

If `2a=2tan10^(@)+tan50^(@), 2b=tan20^(@)+tan50^(@)`
`2c=2tan10^(@)+tan70^(@), 2d=tan20^(@)+tan70^(@)`
Then which of the following is/are correct ?

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tan20^(@)+2tan50^(@)=

2tan10^(@)+tan50^(@)=2x,tan20^(@)+tan50^(@)=2y,2tan50^(@)+tan70^(@)=2w and tan20^(@)+tan70^(@)=2z which of the following is/true

tan10^(@)-tan50^(@)+tan70^(@)=?

tan10^(@) tan 20^(@) tan 30^(@) tan 40^(@) tan 50^(@) tan 60^(@) tan 70^(@) tan 80^(@)=

tan10^(@)-tan50^(@)+tan70^(@)

tan50^(@)-2tan10^(@)=

Tan20^(@) + 2Tan50^(@) =

tan 70^(@) - tan 20^(@) -2 tan 40^(@)=