(-cot^2(x)): This term represents negative one times cot^2(x), which is equal to -1/tan^2x = -cos^2x/sin^2x = -(cosx/sinx)^2. It describes how fast cot x changes with respect to x.
(sec(x) * csc(x)): This term represents the product of sec(x) and csc(x). It describes how fast sec x and csc x change together as x changes.
(tan(-x)): This term represents taking the tangent of negative x. It describes how fast tan(-x) changes with respect to -x.