" (v) "sin18^(@)=cos72^(@)=(sqrt(5)-1)/(4)

Prove that (i) "sin"^(2) 24^(@) - sin^(2) 6^(@) =((sqrt(5)-1))/(8) " "(ii) "sin"^(2) 72^(@) - cos^(2) 30^(@) =(sqrt(5)-1)/(8)

Prove that: sin18^(0)=(sqrt(5)-1)/(4)

(sin 18^@)/( cos 72 ^@) = ?

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))

Show that the value of sin18^(@)" is "(sqrt5-1)/(4)

Evalute: (b) (sin18^(@))/(cos72^(@))

If sin18^(@)=(sqrt(5)-1)/(4) then what is the value of sin81^(@)

Statement -1: If xin[-1//sqrt(3),1//sqrt(3)] then cot^(-1)((3x-x^(3))/(1-3x^(2)))=cos^(-1)((1-x^(2))/(1+x^(2)))rarrx=sqrt(25-10sqrt(5))/(5) statement -2: sin18^(@)=sqrt(5-1)/(4) and cos18^(@)=sqrt(10+2sqrt(5))/4