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" Perpes that "tan70^(@)" and "20^(@)+2tan50^(@)

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

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

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

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

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

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

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

Prove that : tan 70^(@) = tan 20^(@) + 2 tan 50^(@)

Prove that : tan 70^(@)+ tan 10^(@)- tan 50^(@)= sqrt(3)