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" P.T tan "40+2" tan "10=" tanso "...

" P.T tan "40+2" tan "10=" tanso "

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

Prove the following : tan 20^@ tan 40^@ tan 80^@= tan 60^@ .

Prove that : tan 50^@ = tan 40^@ + 2 tan 10^@ .

Prove that: tan 50 ° - tan 40 ° = 2 tan 10 °

Prove that tan 20^@tan 40^@ tan 60^@ tan 80^@ = 3

tan 20^(@) tan 40^(@) tan 80^(@) = tan 60^(@)

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