" (i) "cot7(1)/(2)

which of the following is /are correct? (A) cos72^(0)=(sqrt(5)-1)/(4) (B) sin54^(0)=(sqrt(5)-1)/(4) (C) cot7(1)/(2)^(0)=sqrt(2)+sqrt(3)+sqrt(4)+sqrt(6) (D) 4sin27^(0)=sqrt(5+sqrt(5))+sqrt(3-sqrt(5))

The value of cot7(1)/(2) is

4cos36^(@)+cot7(1)/(2^(@))=

4cos36^(@)+cot(7(1)/(2))^(@)=

If cos36^(@)+cot(7(1)/(2)@)=sqrt(n_(1))+sqrt(n_(2))+sqrt(n_(3))+sqrt(n_(1))+sqrt(n_(5))+sqrt(n_(6)) then the value of sum_(i=1)^(6)n_(i)^(2) must be

4 cos 36^(@) + cot 7 (1^(@))/(2)=

4 cos 36^(circ)+cot (7 (1)/(2))^(circ)=

Show that cot (7 (1)/(2)) = sqrt(2) + sqrt(3) + sqrt(4) + sqrt(6) .

If 4cos36^(@)+cot(7(1^(@))/(2))=sqrt(n_(1))+sqrt(n_(2))+sqrt(n_(3))+sqrt(n_(4))+sqrt(n_(5))+sqrt(n_(6)) , then the value of ((Sigma_(i=1)^(6)n_(i)^(2))/(10)) is equal to