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Prove that tan 70 - tan 20 ^(@)=2 tan 50...

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

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

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

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

Prove that, tan 70^(@) - tan 50^(@) + tan 10^(@) = sqrt3

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

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

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

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

Prove that tan 50^(@) -tan40^(@)-2tan10^(@) .