" (iv) "tan70^(@)=2tan50^(@)+tan20^(@)

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

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

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

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

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

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

Show that : tan 70^(@)=2 tan 40^(@)+ tan 20^(@)+ 4 tan 10^(@)

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

Prove tan 70^@=2tan 50^@+tan 20^@

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