Use the x y coordinates in the figure to find the value of t

Use the (x, y) coordinates in the figure to find the value of the trigonometric function at the indicated real number, t, r state that the expression is undefined. sec 2x Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A. sec 2x = B. The expression is undefined.

Solution

from the figure we can observe that sec( 0 ) = 1; similarly sec( 2*pie) = 1;

2pie indicates 1 complete cycle in terms of radians which is equal to zero as we start fresh

sec( 2 * pie) = 1