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Albeaver89
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This isn't a homework question, but I felt it was appropriate...
Proof that √(x^2)/x=sin(x)
Proof that √(x^2)/x=sin(x)
Albeaver89 said:This isn't a homework question, but I felt it was appropriate...
Proof that √(x^2)/x=sin(x)
I think that should be:Albeaver89 said:This isn't a homework question, but I felt it was appropriate...
Proof that √(x^2)/x=sin(x)
SammyS said:I think that should be:
[itex]\displaystyle \frac{\sqrt{x^2}}{x}=\text{sign}(x)\ .[/itex]
Albeaver89 said:Sorry that's what I thought i had...my bad
No for a couple of reasons. First, the OP meant sign(x) not sin(x). Second,lendav_rott said:Oh nevermind, so basically 1 = sinx .
No. x ≠ ##\sqrt{x^2}##lendav_rott said:So x = arcsin 1
What is really amasing is how they waste the ink to write X as sqrt(x²)
lendav_rott said:Unless there's something hidden here, I cannot see the point.
Well sin X = 1 if X is Pi and the way that the sine's sinusoidal graph repeats itself you can get the other possibilities for X.
Yes, that's exactly what I mean. As an example, do you think that ##\sqrt{(-2)^2} = -2##?lendav_rott said:Wait, x =/= sqrt(x²)??
No, I don't mean that either. The square root of a nonnegative expression produces a single value, not two of them, as ± x implies.lendav_rott said:I cannot see what you are trying to say - do you mean that sqrt(x²) = +/- X?
Your lecturer is correct.lendav_rott said:This is actually something I was arguing over with my math's lector and he said that the square root of X or X² for that matter, is defined as sqrt(X²) = |X|
Also, your second step isn't valid if A ≤ 0, because ln(A) wouldn't be defined.lendav_rott said:And after thinking about it, i thought about
A^x = B
x lnA = lnB
if B were negative then this wouldn't hold true and the only explanation is that Sqrt(A²) = |A|
The statement is an equation that is used to prove a mathematical concept or relationship between the square root of x squared divided by x and the sine of x. It is commonly used in trigonometry and calculus.
To solve this equation, you can use algebraic manipulations and trigonometric identities to simplify the left side of the equation until it is equal to the right side. This may involve factoring, expanding, and using the Pythagorean identity.
This equation is significant because it shows the relationship between the square root of a number and its sine value. It can also be used to prove other trigonometric identities and to solve for unknown values in more complex equations.
Yes, this equation can be used in various real-world applications such as in geometry, physics, and engineering. For example, it can be used to calculate the height of a building or the distance between two objects based on their angles and distances.
Like any mathematical equation, there are limitations to its applicability. It may not be suitable for certain values of x, such as negative numbers, and it may not accurately represent all real-world scenarios. Additionally, it may be limited in its use for more complex problems that involve multiple variables and equations.