How do I solve 4cos^2 x -1=0

Click on the graphic until you find the right quotient. (36xa - 30xb) ÷ (-6x2)

The speed of a falling object increases at a constant rate as time increases since the object was dropped. which graph could represent the relationship betweent time in seconds, and s, speed in meters per second? speed of a falling object object over time

What is the value of x? enter your answer in the box. x = two intersecting tangents that form an angle of x degrees and an angle of 134 degrees.