I have the following question: Given a polynom p <mo stretchy="false">( x <mo stretc

Trace Mcintyre

Trace Mcintyre

Answered question

2022-05-03

I have the following question:
Given a polynom p ( x ) I need to prove the the equation tan x = p ( x ) has at least one solution.
I defined the difference as a function f ( x ) = tan x p ( x ) and I know that f ( x ) is continues in any interval where tan x is defined, so I am trying to use the Intermediate value theorem, but I don't know how.

Answer & Explanation

RormFrure6h1

RormFrure6h1

Beginner2022-05-04Added 13 answers

Consider
g ( x ) = cos x p ( x ) sin x
We have g ( π / 2 ) = 1 and g ( π / 2 ) = 1. Hence g ( x 0 ) = 0 for a point x 0 , π / 2 < x 0 < π / 2. Thus
p ( x 0 ) = sin x 0 cos x 0 = tan x 0

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