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3 alphaquad (" iv ")tan70^(@)=2tan50^(@)...

3 alphaquad (" iv ")tan70^(@)=2tan50^(@)+tan20^(@)

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

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

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

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

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

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

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

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

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