How do i prove 2sec^2x-2sec^2xsin^2-sin^2x-cos^2x= 1

Two rigid transformations are used to map abc to qrs. the first is a translation of vertex b to vertex r. what is the second transformation? a reflection across the line containing ab a rotation about point b a reflection across the line containing cb a rotation about point c

What term best describes a line and a point that lie in the same plane? a. congruent b. coplanar c. collinear d. equal

Lines b and c are parallel. what is the measure of 2? m2 = 31° m2 = 50° m2 = 120° m2 = 130°