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[" 16.Prove that : "],[[" (i) "tan70^(@)...

[" 16.Prove that : "],[[" (i) "tan70^(@),=2tan50^(@)+tan20^(@)]]

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

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

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

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

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

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

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

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