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" (w) tan "40^(@)+2" tan "10^(@)=" tan "...

" (w) tan "40^(@)+2" tan "10^(@)=" tan "50^(@)

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

Evaluate without using trigonometric tables : tan 20^(@) tan 40^(@) tan 50^(@) tan 70^(@)

tan 70^(@) -tan 20^(@) - 2 tan 40^(@) = 4 tan 10 ^(@).

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

Prove that tan 70^(@)-tan 20^(@)-2 tan 40^(@)=4 tan 10^(@)

Prove that tan 70^(@) - tan 20^(@) - 2 tan 40^(@) = 4 tan 10^(@) .

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

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

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

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