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" xample "19" Prove that "tan70^(@)=tan2...

" xample "19" Prove that "tan70^(@)=tan20^(@)+2tan50^(@)

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

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

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

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

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

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

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

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

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

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