`2sin 60^(@)-cos180^(@)+(1//3)sin270^(@)=`A)`sqrt2+(3)/(2)` B)`sqrt3+(2)/(3)` C)`sqrt2-(3)/(2)` D)`sqrt3-(2)/(3)`

cos45^(@)cos60^(@)-sin45^(@)sin60^(@)=(sqrt(3-1))/(2sqrt(2))

cos45^(@)cos60^(@)-sin45^(@)sin60^(@)=(sqrt(3)-1)/(2sqrt(2))

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

sin ^(-1) (sqrt(3))/(2) + sin ^(-1) sqrt(2/3)=

frac(cos60^@ + sin 60^@)(cos60^@- sin 60^@) is equal to (A) -(sqrt3 +2) (B) -1 (C ) (sqrt3 -2) (D) (sqrt3 + 2)

1/(cos80^(@))-sqrt(3)/(sin80^(@)) is equal to a) sqrt(2) b) sqrt(3) c)2 d)4

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)

sin^(-1)(-(sqrt(3))/(2))+cos^(-1)((sqrt(3))/(2))