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Prove that tan 70^(@) = "tan " 20^(@) ...

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

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

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

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

The value of (tan 70^(@) - tan 20^(@))/( tan 50^(@))=

Prove that: (i) tan 50^(@)="tan"40^(@)+2 tan 10^(@) (ii) 2 tan 70^(@)="tan"80^(@)-"tan"10^(@)

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

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

tan 20^(@) + tan 25^(@) +tan 20^@ tan25^(@)=

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

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