[cos^(2)48^(@)-sin^(2)12^(@)=,],[([" (A) "(sqrt(5)-1)/(4)," (B) "(sqrt(5)+1)/(8)],[" (C) "(sqrt(3)-1)/(4)," (D) "(sqrt(3)+1)/(2sqrt(2))]]

The value of cos^(2)48^(@)-sin^(2)12^(@) is ........... A) (sqrt5-1)/( 4) B) (sqrt5+1)/(8) C) (sqrt3-1)/(4) D) (sqrt3+1)/(2sqrt2)

cos ^(2) 48^(@) - sin ^(2) 12 ^(@) = (sqrt5+1)/(8).

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

cos^2 4 5^(@)-sin^2 1 5^(@)= ................. A) (sqrt3)/(2) B) (sqrt3)/(4) C) (sqrt3+1)/(2sqrt2) D) (sqrt3+1)/(2sqrt2)

2. "(sqrt(8))^((1)/(3))="? (a) "2," (b) "4" (c) "sqrt(2)," (d) "2sqrt(2)"

sqrt((4)/(3))-sqrt((3)/(4))=?(4sqrt(3))/(6) (b) (1)/(2sqrt(3))(c)1(d)-(1)/(2sqrt(3))

sin 75^(@)= ..................... A) (2- sqrt3)/(2) B) (sqrt3+1)/(2sqrt2) C) (sqrt3-1)/(-2sqrt2) D) (sqrt3-1)/(2sqrt2)

Let alpha = tan^-1 (1/2)+tan^-1(1/3) , beta=cos^-1(2/3)+cos^-1(sqrt5/3) , gamma=sin^-1(sin((2pi)/3))+1/2cos^-1(cos((2pi)/3)) then cosalpha+cosbeta+cosgamma is equal to (A) (sqrt(2)-1)/2 (B) (sqrt(2)+1)/2 (C) (sqrt(2)+sqrt(3))/2 (D) ((sqrt(3)-sqrt(2))/2)

Let alpha = tan^-1 (1/2)+tan^-1(1/3) , beta=cos^-1(2/3)+cos^-1(sqrt5/3) , gamma=sin^-1(sin((2pi)/3))+1/2cos^-1(cos((2pi)/3)) cosalpha+cosbeta+cosgamma is equal to (A) (sqrt(2)-1)/2 (B) (sqrt(2)+1)/2 (C) (sqrt(2)+sqrt(3))/2 (D) ((sqrt(3)-sqrt(2))/2

(sqrt8)^(1/3) = ? (a) 2 (b) 4 (c) sqrt2 (d) 2sqrt2