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tan50^(@)=tan40^(@)+2tan10^(@)...

tan50^(@)=tan40^(@)+2tan10^(@)

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

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

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

tan 10^(@)*tan20^(@)*tan30^(@)*tan40^(@)*tan50^(@)*tan60^@tan70^(@)*tan80^(@)=

Prove that: tan10^(@)tan50^(@)+tan50^(@)tan70^(@)+tan70^(@)tan170^(@)=3

Evaluate : (3tan25^(@)tan40^(@)tan50^(@)tan65^(@)-(1)/(2)tan^(2)60^(@))/(4(cos^(2)29^(@)+cos^(2)61^(2)))

Evaluate : (3tan25^(@)tan40^(@)tan50^(@)tan65^(@)-(1)/(2)tan^(2)60^(@))/(4(cos^(2)29^(@)+cos^(2)61^(2)))

(2sin68^(@))/(cos22^(@))-(2cot15^(@))/(5tan75^(@))-(3tan45^(@).tan20^(@).tan40^(@).tan50^(@).tan70^(@))/(5) is equal to