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सिद्ध कीजिए tan 70^(@)=2 tan 50^(@)+tan ...

सिद्ध कीजिए `tan 70^(@)=2 tan 50^(@)+tan 20^(@)`

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

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

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

Prove tan 70^@=2tan 50^@+tan 20^@

tan10^(@)-tan50^(@)+tan70^(@)

tan20^(@)+2tan50^(@)=

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

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