If `x , y ,z in [-1,1]` such that `cos^(-1)x+cos^1y+cos^(-1)z=3pi,` then find the values of `x y+y z+z y` `x(y+z)+y(z+x)+z(x+y)`

If x , y ,z in [-1,1] such that cos^(-1)x+cos^1y+cos^(-1)z=3pi, then find the values of (1). x y+y z+z y and (2). x(y+z)+y(z+x)+z(x+y)

If x , y ,z in [-1,1] such that cos^(-1)x+cos^1y+cos^(-1)z=3pi, then find the values of (1) x y+y z+z y and (2) x(y+z)+y(z+x)+z(x+y)

If x , y ,z in [-1,1] such that cos^(-1)x+cos^1y+cos^(-1)z=3pi, then find the values of (1) x y+y z+z x and (2) x(y+z)+y(z+x)+z(x+y)

If x,y,z in[-1,1] such that cos^(-1)x+cos^(1)y+cos^(-1)z=3 pi, then find the values of (1)xy+yz+zy and (2)x(y+z)+y(z+x)+z(x+y)

If x ,\ y ,\ z in [-1,1] such that cos^(-1)x+cos^(-1)y+cos^(-1)z=0 , find x+y+z .

If x,y,z in[-1,1] such that cos^(-1)x+cos^(-1)y+cos^(-1)z=0, find x+y+z

If cos^(-1)x +cos^(-1)y +cos^(-1)z =3pi then x+y+z is :

If cos e c^(-1)x+cos e c^(-1)y+cos e c^(-1)z=-(3pi)/2, find the value of x/y+y/z+z/xdot

If : cos^(-1)x+cos^(-1)y+cos^(-1)z=3pi, " then :" x (y+z)+y(z+x)+z(x+y)=

If cos ^(-1) x+cos ^(-1) y+cos ^(-1) z=3 pi then x y+y z+z x=