(cos(sqrt(5))/(2))

then -x^(2)=((sqrt(5)-1)/(2)) b.x^(2)=((sqrt(5)+1)/(2)) c.sin(cos^(-1)x)=((sqrt(5)-1)/(2))dtan(cos^(-1)x)=((sqrt(5)-1)/(2))

cos ^(-1)"" (1)/(sqrt(5))+ cos ^(-1) ""(2)/(sqrt(5))=(pi)/(2)

Solve the equation: (4sqrt((cos x)/(2))-5-(sqrt(2))/(2))^(2)+sqrt(2)(4sqrt((cos x)/(2))-5-(sqrt(2))/(2))-(cos x)/(2)=0

If (sin A)/(sin B)=(sqrt(3))/(2) and (cos A)/(cos B)=(sqrt(5))/(2) then tan A+tan B is equal to

cos^(-1)x = tan^(-1)x , then: a. x^2=((sqrt(5)-1)/2) b. x^2=((sqrt(5)+1)/2) c. sin(cos^(-1)x)=((sqrt(5)-1)/2) d. tan(cos^(-1)x)=((sqrt(5)-1)/2)

The value of cos48cos12 (A) (sqrt(5)+3)/(8) (B) (3-sqrt(5))/(2) (C) (sqrt(5)+1)/(4) (D) (sqrt(5)-1)/(4)

If quad x_(1)=cos^(-1)((3)/(5))+cos^(-1)((2sqrt(2))/(3)) and x_(2)=sin^(-1)((3)/(5))+sin^(-1)((2sqrt(2))/(5))

The value of expression tan^(-1)((sqrt(2))/(2))+sin^(-1)((sqrt(5))/(5))-cos^(-1)((sqrt(10))/(10))

The value of tan(1/2 cos^(-1)(2/(sqrt(5)))) is