" 2) Prove that "cot12^(@)cot38^(@)cot52^(@)cos78^(@)cot60^(@)=(1)/(sqrt(3))

Prove that cot12^(@)cot38^(@)cot52^(@)cot78^(@)cot60^(@)=(1)/(sqrt3)

cot10^(@)cot20^(@)cot60^(@)cot70^(@)cot80^(@)=

cot780^(@)=cot(2xx360^(@)+60^(@)) =cot60^(@)=(1)/(sqrt(3))

cot6^(0)cot42^(0)cot66^(@)cot78^(@)=1

cot12^(@)cot102^(@)+cot102^(@)cot66^(@)+cot66^(@)cot12^(@) =

Find the value of cot 12^@ cot38^@cot 52^@cot78^@cot60^@ .

Prove that cot^(-1)7+cot^(-1)8+cot^(-1)18=cot^(-1)3

Prove that: cot^(-1)7+cot^(-1)18=cot^(-1)5 .

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

Prove that cot^(-1)(3)-cot^(-1)(4)=cot^(-1)(13)