My trig book lists the reciprocal identity of cot x as cot x = cos x/sin x. But the professor gave us a formula sheet with it listed as cot x = 1/tan x. All the rest of the formulas in both the book and handout are the same, and they're both titled "Fundamental Reciprocal Identities" So which cotangent one is correct? I'm confused.
Any help is greatly appreciated!