Roots of equations in R language dichotomy and Newton iteration

Newton-Raphson Method is an iterative method based on the initial value guess of the root , The function used in this method is the original function and the derivative of the original function , If it works , It usually converges quickly , But it may also fail like other root seeking methods , This is a point to note .( Because Newton's method does not always converge , Its convergence theory acts on local convergence ）

Calculate the root of the following equation

e x + c o s x + x = 0 e^x + cosx + x = 0 e