# derivative of inverse secant | Summary and Q&A

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January 17, 2015
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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.

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### 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)).