Finding the Equation of Tangent line on cos wave

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Discussion Overview

The discussion revolves around finding the equation of the normal line to the function y = 2cos(4x) at the point x = π/3. The scope includes calculus concepts related to derivatives and the relationship between tangent and normal lines.

Discussion Character

  • Homework-related

Main Points Raised

  • One participant expresses uncertainty about how to start solving the problem and requests assistance.
  • Another participant suggests that finding the tangent line should be straightforward and prompts the original poster to consider the derivative at the specified point.
  • A clarification is made that the original question specifically asks for the normal line, not the tangent line.
  • A participant indicates that the distinction between tangent and normal lines is important and asks about the angle between them.
  • There is a suggestion to find the slope of the tangent line first, which can then be used to determine the slope of the normal line, along with the point through which the line passes.
  • A participant notes that the problem is not related to differential equations and moves the discussion to the "Calculus" category.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the approach to take, as there is confusion regarding whether to focus on the tangent or normal line, and the discussion remains unresolved.

Contextual Notes

The discussion reflects a lack of clarity on the definitions and relationships between tangent and normal lines, as well as the necessary steps to solve the problem.

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Finding the Equation of Tangent line on cos wave!

Find the equation of the normal line to y = 2cos ( 4x) at x = [tex]\pi[/tex] / 3
I don't even know where to start with this question, i have searched the textbook and internet, help would be appreciated.
 
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So tangent or normal?

Tangent should be quite easy - what do you know about value of derivative at a point?

What do you know about normal and tangent? Any specific angle between them?
 


its finding the normal sorry, should of said that instead,, what I've put in as the question is all the questions asks.
 


It doesn't change much - try to answer questions from my previous post.
 
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Since this problem doesn't have anything to do with differential equations, I am moving it to "Calculus".
 


Find the slope of the tangent line. From that you can find the slope of the normal line. You also know a point that the line passes through.
 

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