(cot^(2)15^(@)-1)/(cot^(2)15^(@)+1)=

cot (15^(@) -A) + tan(15^(@) + A) =

Prove that (tan75^(@))/(cot15^(@))=1

if cot15^(@)=m, " then find " (cot195^(@)+cot345^(@))/(tan15^(@)-cot105^(@))

If tan15^(@)=2-sqrt(3) then value of tan15^(@)cot75^(@)+tan75^(@)cot15^(@) is

If tan15^(@)=2-sqrt(3) , the value of tan15^(@)cot75^(@)+tan75^(@)cot15^(@) is

If alpha,beta are the roots of the equation cot^(-1)x-cot^(-1)(x+2)=15^(@) then the value of -(alpha+beta) is

Suppose that neither A-15^(@) nor A-75^(@) is an integral multiple of 180^(@) . Then prove that cot(15^(@)-A)+tan(15^(@)+A)=(4cos2A)/(1-2sin2A) and deduce that tan 15^@)=2-sqrt(3) .

cot (A+15^(@))- tan(A-15^(@))=

tan15^(@)-cot15^(@)=

cot 15^(@) + cot 75^(@) + cot 315^(@) =