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" Prove that "tan40^(@)+2tan10^(@)=tan50...

" Prove that "tan40^(@)+2tan10^(@)=tan50^(@)

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

Prove that tan70^(@)-tan20^(@)=2tan50^(@) .

Prove that: tan70^(@)=tan20^(@)+2tan50^(@)

Prove that tan70^(@)=2tan50^(@)+tan20^(@) .

Prove that tan70^(@)=2tan50^(@)+tan20^(@)

Prove that tan 40^(@) + 2 tan 10^(@) = tan 50^(@)

Prove that tan 50^(@) -tan40^(@)-2tan10^(@) .

Prove that: tan10^(@)tan50^(@)+tan50^(@)tan70^(@)+tan70^(@)tan170^(@)=3

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Prove that tan20^(@) tan40^(@) tan80^(@) = sqrt3