Calculus > Proof of the Derivative Tan x The derivative tan x is sec2x: There are a couple of ways to prove the derivative tan x. You could start with the definition of a derivative and prove the rule using…

Calculus > Proof of the Derivative Tan x The derivative tan x is sec2x: There are a couple of ways to prove the derivative tan x. You could start with the definition of a derivative and prove the rule using…