(iv)tan50^(@)-tan40^(@)=2tan10^(@)

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tan50^(@)-2tan10^(@)=

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

If tan50^(@)-tan40^(@)=k tan10^(@) then the value of k is

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

Prove the following identities: tan50^(@) = tan40^(@) + 2tan10^(@)

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

Find the exact value of the expression (tan70^(@)-tan20^(@)-2tan40^(@))/(tan10^(@))

tan20^(@)tan40^(@)tan80^(@)

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

Prove that: (i) tan 50^(@)="tan"40^(@)+2 tan 10^(@) (ii) 2 tan 70^(@)="tan"80^(@)-"tan"10^(@)