Use the unit circle to find sec(-90) degrees

Graph g(x)=2cosx . use 3.14 for π . use the sine tool to graph the function. graph the function by plotting two points. the first point must be on the midline and closest to the origin. the second point must be a maximum or minimum value on the graph closest to the first point.

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

The sum of these consecutive integers is equal to 9 less than 4 times the least of the integer. find the three integers