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Prove that tan 70^(@) = "tan " 20^(@) ...

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

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

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

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

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

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Prove that tan 70^@=tan 20^@+2tan50^@

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