Find the angle between any two diagonals of a cube.

Prove that the smaller angle between any two diagonals of a cube is cos^(-1)""(1)/(3) .

An ellipse is inscribed in a reactangle and the angle between the diagonals of the reactangle is tan^(-1)(2sqrt(2)) , then find the ecentricity of the ellipse

The angle between any two orthogonal unit vectors

Find the angle between the two tangents from the origin to the circle (x-7)^2+(y+1)^2=25

If theta is the angle between any two vectors vec a and vec b , then |vec a. vec b| = | vec a xx vec b| , when theta is equal to

Three metal cubes with edges 15 cm, 12 cm and 9 cm, respectively are melted together and formed into a single cube. Find the diagonal of this cube.

Find the angle between two vectors vec a and vec b with magnitudes sqrt3 and 2, respectivey having vec a. vec b = sqrt6 .

When the light ray is incident normal to the interface between any two media, the angle of incidence is ___________ .

Find the angle between two vectors veca nd vecb if abs(vecaxxvecb)=veca.vecb .