The terminal ray of angle β, drawn in standard position, passes through the point (−7, 2√3) .
What is the value of cosβ?
Enter your answer, in simplest radical form, in the box.
cos B = x / r
r = √ [ (-7)^2 + (2√3)^2 ] = √ [ 49+ 12] = √61
So
cos B = -7 /√61 = -7√61/ 61
