Understanding Integrals: Multiplying by a Constant Within the Integral?

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When multiplying the left-hand side of an integral by a constant, the right-hand side of the equation must also reflect that constant if it applies to the entire integral. The discussion clarifies that multiplying an integral by a constant does not equate to multiplying the integrand by that constant unless specified. It emphasizes that the relationship between functions and their integrals is not straightforward, particularly in the context of differential equations. The conversation suggests a need for clarity in understanding calculus principles, particularly when dealing with variable versus constant multiplications. Understanding these nuances is essential for mastering integral calculus concepts.
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if you have \int_frac{y}{x}=int_L, if you multiply the LHS by c within the integral, is L multiplied by c within its integral?
 
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Do you mean this?

\int \frac{y}{x} = \int L

- Warren
 
or are you talking about multiplying some constant with an integral ?

- Marlon

c * \int\frac {y}{x} = \int cL ?
 
Not a constant, another variable.
 
If you mean "Is f(x)\int g(x)dx= \int f(x)g(x)dx" the answer is no:
x\int xdx= \frac{1}{2}x^3+ C and \int x^2dx= \frac{1}{3}x^3+ C.

I may be misunderstanding your question since if you are taking differential equations, you certainly should know calculus enough that that would be obvious.
 
Stewart has a first order differential equation section in 2nd semester calculus.
 
Here is a little puzzle from the book 100 Geometric Games by Pierre Berloquin. The side of a small square is one meter long and the side of a larger square one and a half meters long. One vertex of the large square is at the center of the small square. The side of the large square cuts two sides of the small square into one- third parts and two-thirds parts. What is the area where the squares overlap?

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