Thread: solve x cos(x) = -(3pi+2)/2pi

Hello.

I would be thankful if someone would give me a help in finding a solution for
x cos(x) = -(3pi+2)/2pi

Regrads.

Originally Posted by primer

Hello.

I would be thankful if someone would give me a help in finding a solution for
x cos(x) = -(3pi+2)/2pi

Regrads.

I do not think you can using elementary algebraic methods.
But if you want to approximate the solution you can use Newton's-Raphson Method.

Originally Posted by primer

Hello.

I would be thankful if someone would give me a help in finding a solution for
x cos(x) = -(3pi+2)/2pi

Regrads.

This almost certainly does not have a simple closed form solution in simple
terms. Numerically its easy to find approximate solutions:

x = 2.420631593

is ~the smallest positive real solution

RonL