Deriving the Derivative Formula for Inverse of sinx on [-pi/2,pi/2]?

In summary, using the Inverse Function Theorem, the formula for the derivative of the inverse of sinx on the interval [-pi/2, pi/2] can be derived by solving for dy/dx in the equation 1 = cos(y) * dy/dx and replacing y with sin^(-1)(x).
  • #1
kathrynag
598
0

Homework Statement


Use Inverse Function Thm to derive the formula for the derivative of the inverse of sinx on the interval [-pi,2,pi/2]



Homework Equations


f^-1(f(x))=1/f'(x)



The Attempt at a Solution


1/cosx
 
Physics news on Phys.org
  • #2
I vaguely remember a formula something like the one you show, but I think you have it wrong. f^(-1)(f(x)) on the left side would simplify to just plain x, and I don't see how that would be equal to 1/f'(x).
 
  • #3
Or maybe not...

Try this:
y = sin^(-1)(x) [tex]\iff[/tex] x = sin(y)
Now differentiate implicitly with respect to x, getting
1 = cos(y) * dy/dx

Solve for dy/dx, and in the resulting expression, replace y with what it's equal to.
 
  • #4
Never mind I figured it out.
 

FAQ: Deriving the Derivative Formula for Inverse of sinx on [-pi/2,pi/2]?

What is the Inverse Function Theorem?

The Inverse Function Theorem is a mathematical theorem that states that if a function has a continuous derivative at a point, and the derivative is non-zero at that point, then the function is locally invertible near that point.

How is the Inverse Function Theorem used in mathematics?

The Inverse Function Theorem is used to prove the existence and uniqueness of local inverses for differentiable functions. It is also used in the study of differential equations and in the field of topology.

What is the significance of the Inverse Function Theorem?

The Inverse Function Theorem is significant because it provides a way to determine if a function is locally invertible. This is important in many areas of mathematics and science, as it allows for the study and manipulation of functions that may have previously been considered too complex.

What are the conditions for the Inverse Function Theorem to hold?

The Inverse Function Theorem holds under the conditions that the function is differentiable and has a non-zero derivative at the point in question. Additionally, the domain and range of the function must be open sets.

Are there any limitations to the Inverse Function Theorem?

Yes, there are limitations to the Inverse Function Theorem. It only applies to differentiable functions, and it only guarantees the existence and uniqueness of local inverses near a specific point. It does not necessarily hold for the entire function or domain.

Similar threads

Back
Top