" 25."tan50^(@)-tan40^(@)=

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

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

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

(cot50^(@))/(tan40^(@))

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

Evaluate without using trigonometric tables : tan 20.tan 40^(@) tan 50^(@) tan 70^(@)

tan 20^(@) + tan40^(@) + sqrt(3).tan 20^(@).tan 40^(@)=

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

Prove that, tan25^(@).tan15^(@)+tan15^(@)tan50^(@)+tan25^(@)tan50^(@)=1 .

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