# derivative of inverse secant | Summary and Q&A

65.1K views
January 17, 2015
by
blackpenredpen
derivative of inverse secant

## TL;DR

The video explains how to find the derivative of the inverse secant x using the connection between the original and inverse secant functions.

## Key Insights

• ❓ The derivative of inverse trigonometric functions can be found by connecting them to their original counterparts.
• 🔺 Considering theta as the angle represented by the inverse function can simplify the equation.
• 🆘 Applying the derivative of the original function helps in finding the derivative of the inverse function.
• 😑 The derivative of the inverse secant x can be expressed as 1 / (x √(x² - 1)).
• ⚾ The absolute value around X in the formula may vary based on different definitions and conventions.
• ❓ Understanding the concept of inverse trigonometric functions is essential for solving derivative problems.
• 📏 The chain rule is involved in finding the derivative of inverse trigonometric functions.

## Transcript

let's derive a formula for the derivative of the inverse secant x we only know what's the derivative of the original secant so we must make a connection between the original and the inverse and that's the strategy for any inverse trick functions they all represent an angle so I Can Begin by saying something like the theta equals to the angle that w... Read More

### Q: How can we find the derivative of the inverse secant x?

To find the derivative of the inverse secant x, we can make a connection between the original secant and the inverse. By considering theta as the angle represented by the inverse secant x, we can modify the equation and apply the derivative of the original secant to find dtheta/dx.

### Q: What is the advantage of using the equation with the original secant?

Using the equation with the original secant allows us to cancel out the original and inverse secant terms, simplifying the equation and making it easier to find the derivative of the inverse secant x.

### Q: How can we express dtheta/dx in terms of x?

To express dtheta/dx in terms of x, we divide both sides of the equation by secant theta tangent theta. By substituting theta with the inverse secant x, we obtain the expression 1 / (x √(x² - 1)).

### Q: Why is there sometimes an absolute value around the X in the formula?

The absolute value around the X in the formula may appear due to different definitions and conventions regarding inverse trigonometric functions. While the main part of the formula remains the same, the inclusion of the absolute value may depend on specific textbook definitions or teaching methods.

## Summary & Key Takeaways

• The video demonstrates the strategy for finding the derivative of inverse trigonometric functions by connecting them to their original counterparts.

• By considering theta as the angle represented by the inverse secant x, the equation is modified to include the original secant on both sides.

• Applying the derivative of the original secant, the equation is simplified to find dtheta/dx, which can then be expressed as 1 / (x √(x² - 1)).