Integrating 1/(1+cosx) from -pi/2 to pi/2

  • Thread starter Thread starter Math9999
  • Start date Start date
  • Tags Tags
    Integral
Click For Summary

Homework Help Overview

The discussion revolves around finding the integral of the function 1/(1+cosx) over the interval from -π/2 to π/2. The subject area pertains to calculus, specifically integral calculus.

Discussion Character

  • Exploratory, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss manipulating the integrand by rewriting it in terms of sine and cosine. There are attempts to simplify the expression and suggestions to split the integral into parts. Some participants express uncertainty about the simplification process.

Discussion Status

The discussion includes various attempts at simplification and manipulation of the integral. Some participants indicate that they have found helpful hints or insights, while others are still exploring different approaches without reaching a consensus.

Contextual Notes

There are indications of multiple interpretations of the problem, and some participants mention hints that may lead to a quicker solution. However, no explicit consensus or resolution has been reached.

Math9999

Homework Statement


Find the integral of 1/(1+cosx) dx from -pi/2 to pi/2.

Homework Equations


None.

The Attempt at a Solution


Here's my work:
1/(1+cosx)=(1-cosx)/((1+cosx)(1-cosx))=(1-cosx)/(1-cos^2 x)=(1-cosx)/sin^2 x
This is what I've got so far. But this doesn't seem to simplify the integrand.
 
Physics news on Phys.org
Math9999 said:

Homework Statement


Find the integral of 1/(1+cosx) dx from -pi/2 to pi/2.

Homework Equations


None.

The Attempt at a Solution


Here's my work:
1/(1+cosx)=(1-cosx)/((1+cosx)(1-cosx))=(1-cosx)/(1-cos^2 x)=(1-cosx)/sin^2 x
This is what I've got so far. But this doesn't seem to simplify the integrand.
That looks good so far. What about splitting up the integral into two now?
 
  • Like
Likes   Reactions: Math9999
Never mind. I got it. You gave me the big hint already, splitting it up.
 
Thank you so much! Merry Christmas!
 
Math9999 said:
Never mind. I got it. You gave me the big hint already, splitting it up.
There was a quicker way. Hint: ##x = 2(x/2)##.
 
Wow.
 

Similar threads

Replies
3
Views
2K
  • · Replies 9 ·
Replies
9
Views
4K
  • · Replies 8 ·
Replies
8
Views
2K
  • · Replies 18 ·
Replies
18
Views
2K
  • · Replies 6 ·
Replies
6
Views
2K
Replies
7
Views
2K
  • · Replies 1 ·
Replies
1
Views
1K
  • · Replies 7 ·
Replies
7
Views
3K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K