What is the line tangent to the circle at the given point x^2+y^2=13 at (2,3)

Well, the derivative is the same, since 13 as well as 20, are both constants, so they simply zero out anyway

Period is the time it takes for one “cycle” to complete. in the parent sine function, period is 2*pi since sin(0) = 0, sin(pi/2) = 1, sin(pi) = 0, sin(3pi/2) = -1, and sin(2pi) = 0. at that point, the sequence repeats itself. i’m not sure if your graph is similar to the sine function since you didn’t provide a picture, but you can find the period by looking at a graph.