((tan225^(@)-cot81^(0)cot69^(@)))/((cot261^(@)+tan21^(0)))=

(tan225^(@)-cot81^(@)cot69^(@))/(cot261^(@)+tan21^(@))

(tan25^(@)-cot81^(@)cot69^(@))/(cot216^(@)+tan21^(0))=

(Tan225^(@)-Cot81^(@).Cot69^(@))/(Cot261^(@)+Tan21^(@))=

tan225^(@)cot405^(@)+tan765^(@)cot675^(@)=0

Find the value of (cot25^(@)+cot55^(@))/(tan25^(@)+tan55^(@))+(cot55^(@)+cot100^(@))/(tan55^(@)+tan100^(@))+(cot100^(@)+cot25^(@))/(tan100^(@)+tan25^(@))

Find the value of (cot 25^(@)+cot 55^(@))/(tan 25^(@)+tan55^(@))+(cot 55^(@)+cot 100^(@))/(tan 55^(@)+tan 100^(@))+(cot 100^(@)+cot 25^(@))/(tan 100^(@)+tan 25^(@))

Prove that: tan(-225^(@))cot(-405^(@))-tan(-765^(@))cot(675^(@))=0

(tan40^(@)+tan20^(@))/(tan225^(@)-cot50^(@)cot70^(@))=(i)sqrt(3)(ii)(1)/(sqrt(3))(iii)1(iv)0

Evaluate each of the following: cot12^(@)cot38^(@)cot52^(@)cot60^(@)cot78^(@)tan5^(@)tan25^(@)tan30^(@)tan65^(@)tan85^(@)

If cot 20^@=p then (tan16 0^(@)-tan11 0^(@))/(1+tan16 0^(@)tan11 0^(@))=