Why does sin^2θ/cos^2θ-1 simplify to sin^θ/-sin^θ?

Solve the system by the elimination method. 2x + y - 4 = 0 2x - y - 4 = 0 when you eliminate y, what is the resulting equation? a.x = 0 b.4x = -8 c.4x = 8

What is the difference between the points (4, 7) and (4, -5)? a. 0 units b. 2 units c. 4 units d. 12 units

Evaluate cos2θ for cosθ = square root of 3/2