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[" Sum and difference formulae "],[" 12....

[" Sum and difference formulae "],[" 12."tan20^(@)+2tan50^(@)=],[[" (A) "tan70^(@)," (B) "cot70^(@)," (C) "]]

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

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

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

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

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

The value of tan20^(@)+2 tan50^(@)-tan70^(@), is

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

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