70-5quad x-y=13=sqrt(x)+sqrt(y)vec b)" ¿ed "quad " A) "hat Delta,P|

(sqrt(x)+sqrt(y))^(2)=x+y+2sqrt(xy) and sqrt(x)sqrt(y)=sqrt(xy) , where x and y are positive real numbers . If x=2sqrt(5)+sqrt(3) and y=2sqrt(5)-sqrt(3) , then x^(4)+y^(4) =

If x=sqrt(7)-sqrt(5) and y=sqrt(13)-sqrt(11) then

The angles of triangle, two of whose sides are represented by vectors sqrt(3)( vec axx vec b) \a n d \ vec b-( hat adot vec b) hat a ,w h e r e vec b is a non zero vector and hat a is unit vector in the direction of vec a , are

The angles of triangle, two of whose sides are represented by vectors sqrt(3)( vec axx vec b) \a n d \ vec b-( hat adot vec b) hat a ,w h e r e vec b is a non zero vector and hat a is unit vector in the direction of vec a , are

If 0 (a) sqrt(x)-\ sqrt(y)=\ sqrt(x-y) (b) sqrt(x)+\ sqrt(x)=\ sqrt(2x) (c) xsqrt(y)=ysqrt(x) (d) sqrt(x y)=\ sqrt(x)\ sqrt(y)

If 0

If sqrt(3)x-sqrt(2y)=sqrt(3);sqrt(5)x+sqrt(3)y=sqrt(2) then x and y are