(4,1) and (-4,1) are they undifined

Evaluate cos2θ for cosθ = square root of 3/2

A3-dimensional figure has a square base and 4 lateral faces that meet at a point. explain the difference between the cross sections when a slice is made perpendicular to the base through the vertex, and when a slice is made perpendicular to the base and not through the vertex

Use the distributive property -7(-2x+u-2)