# Equation of the Tangent Line for y = 3ln((e^x + e^(-x))/2) at (0,0) | Summary and Q&A

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November 27, 2015
by
The Math Sorcerer
Equation of the Tangent Line for y = 3ln((e^x + e^(-x))/2) at (0,0)

## TL;DR

The video explains how to find the equation of a tangent line to a function graph at a specific point using derivatives.

## Key Insights

• 🫥 The derivative of a function gives the slope of the tangent line at any point on the graph.
• 👻 The logarithmic quotient rule allows for the simplification of the function before finding its derivative.
• 🍉 The chain rule is utilized to find the derivative of exponential terms in the function.
• 🫥 The point-slope formula can be used as an alternative method to find the equation of the tangent line.
• 🫥 The slope of the tangent line at the origin in this specific example is 0, resulting in a horizontal line passing through the origin.
• 🫥 Understanding derivatives is essential for determining tangent lines and understanding rates of change.
• 🫥 The formula for finding the equation of a tangent line involves using the slope and a point on the line.

## Transcript

find the equation of the tangent line to the graph of this function at zero zero solution in order to find the equation of the tangent line we need two things we need a point and a slope so we've already got the point we just need the slope the slope of the tangent line to the graph of this function at this point is the derivative so Y prime evalua... Read More

### Q: How do we find the equation of a tangent line to a function graph?

To find the equation of a tangent line, we need a point and a slope. The slope is obtained by evaluating the derivative of the function at the given point.

### Q: What formula is used to rewrite the function before finding the derivative?

The logarithmic quotient rule is used to rewrite the function. It states that the natural log of A divided by B is equal to the natural log of A minus the natural log of B.

### Q: How does the chain rule play a role in finding the derivative of the function?

The chain rule is used when taking the derivative of the exponential terms in the function. It involves multiplying the derivative of the inside function by the derivative of the outside function.

### Q: Can the equation of the tangent line be found using the point-slope formula?

Yes, the equation of the tangent line can also be found using the point-slope formula. By plugging in the point coordinates and the slope, the line equation can be determined.

## Summary & Key Takeaways

• The video teaches how to find the equation of a tangent line by first finding the derivative of the function.

• The quotient rule for logarithms is used to rewrite the function before finding the derivative.

• The slope of the tangent line is the derivative of the function at the given point, which is then used to form the equation of the line.