Undefined

On the unit circle, the x-coordinate is the cosine (cos) of the degrees. 270º has the coordinates of (0,-1) but you are asked to find the secant (sec). sec=##1/cos(º)##. and º=270 so ##1/cos(270)## which equals ##1/0##. Anything divided by zero is undefined.

Undefined

On the unit circle, the x-coordinate is the cosine (cos) of the degrees. 270º has the coordinates of (0,-1) but you are asked to find the secant (sec). sec=##1/cos(º)##. and º=270 so ##1/cos(270)## which equals ##1/0##. Anything divided by zero is undefined.