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

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

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=3pi ,then the value of x^(2012),+y^(2012)+z^(2012)+(6)/(x^(2011)+y^(2011)+z^(2011)) is equal to:

If cos^(-1)x+cos^(-1)y+cos^(-1)=pi, prove that x^(2)+y^(2)+z^(2)+2xyz=1

If cos^(-1)x+cos^(-1)y+cos^(-1)=pi,p rov et h a tx^2+y^2+z^2+2x y z=1.

If cos^(-1)x + cos^(-1)y + cos^(-1)z = 3pi, then xy + yz +zx is equal to

If cos^(-1)x+cos^(-1)y+cos^(-1)z=3 pi, then xy+yz+zx is equal to

If cos^(-1)x + cos^(-1)y + cos^(-1)z = 3pi, then xy + yz +zx is equal to

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 .