MHB Taking Image of a curve about a given line

  • Thread starter Thread starter DaalChawal
  • Start date Start date
  • Tags Tags
    Curve Image Line
AI Thread Summary
To find the image of the function f(x) = x + sin(x) about the line y = -x, the reflection can be expressed as x = y + sin(y), which does not yield an explicit solution for y. The discussion explores whether images can be taken about functions, noting that reflections are typically defined with respect to points or lines. The functions f(x) and its reflection exhibit symmetry around the line y = x and intersect at the point (2π, 2π). The area under the reflected function g between specified limits is calculated to be 2π², leading to a final answer of 2. The exploration highlights the complexities of function reflections and their geometric interpretations.
DaalChawal
Messages
85
Reaction score
0
Screenshot (95).png


How to find image of $f(x)= x + sinx$ about the given line $y = - x$ .

Similarly can we take image of a function about a function? OR is it necessary about which we take image should be a point, line only?
 
Mathematics news on Phys.org
If $y=x+\sin x$, then the reflection around $y=-x$ is $-x=-y+\sin(-y)$ or $x=y+\sin y$. Although a function, this cannot be explicitly solved for $y$. However the two functions are also symmetric around $y=x$ and intersect at the point $(2\pi,2\pi)$. So the area under $g$ between your limits is $2\pi^2$ so your answer is $2$.
 
Suppose ,instead of the usual x,y coordinate system with an I basis vector along the x -axis and a corresponding j basis vector along the y-axis we instead have a different pair of basis vectors ,call them e and f along their respective axes. I have seen that this is an important subject in maths My question is what physical applications does such a model apply to? I am asking here because I have devoted quite a lot of time in the past to understanding convectors and the dual...
Insights auto threads is broken atm, so I'm manually creating these for new Insight articles. In Dirac’s Principles of Quantum Mechanics published in 1930 he introduced a “convenient notation” he referred to as a “delta function” which he treated as a continuum analog to the discrete Kronecker delta. The Kronecker delta is simply the indexed components of the identity operator in matrix algebra Source: https://www.physicsforums.com/insights/what-exactly-is-diracs-delta-function/ by...
Back
Top