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  1. AP Calculus
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What does the area between two curves on a graph represent?

The area represents the integral of the absolute difference between the two functions over a given interval.

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What does the area between two curves on a graph represent?

The area represents the integral of the absolute difference between the two functions over a given interval.

How can you identify the intervals for integration from a graph of two curves?

Look for the x-coordinates (or y-coordinates if integrating with respect to y) where the curves intersect; these are the limits of integration.

How does the relative position of two curves on a graph affect the area calculation?

The curve that is 'above' (or to the right, if integrating with respect to y) is subtracted from the curve that is 'below' (or to the left) within each interval.

How can you visually estimate the area between two curves on a graph?

Approximate the area by dividing it into rectangles or other simple shapes and summing their areas.

What does a point of intersection on the graph of two curves signify?

It indicates a value of x (or y) where the two functions have the same value, marking a potential change in which function is greater.

How does the graph of f(x)−g(x)f(x) - g(x)f(x)−g(x) relate to the area between f(x)f(x)f(x) and g(x)g(x)g(x)?

The area between the graph of f(x)−g(x)f(x) - g(x)f(x)−g(x) and the x-axis represents the area between the curves f(x)f(x)f(x) and g(x)g(x)g(x).

How do you use a graph to determine which function is 'on top' in a given interval?

Visually inspect the graph to see which function has greater y-values (or x-values if integrating with respect to y) within that interval.

What does the sign of f(x)−g(x)f(x) - g(x)f(x)−g(x) indicate on a graph?

If f(x)−g(x)>0f(x) - g(x) > 0f(x)−g(x)>0, then f(x)f(x)f(x) is above g(x)g(x)g(x); if f(x)−g(x)<0f(x) - g(x) < 0f(x)−g(x)<0, then f(x)f(x)f(x) is below g(x)g(x)g(x).

How can you identify regions where you need to split the integral using a graph?

Look for points where the curves intersect; these points indicate where the 'top' and 'bottom' functions switch.

How does a graph help in visualizing the concept of 'absolute value' in area calculation?

It shows that regardless of which function is on top, the area is always positive, as the absolute value ensures we're considering the magnitude of the difference.

What is the formula for the area between two curves y=f(x) and y=g(x) from x=a to x=b?

Area=∫ab∣f(x)−g(x)∣,dx\text{Area} = \int_{a}^{b} |f(x) - g(x)| , dxArea=∫ab​∣f(x)−g(x)∣,dx

How do you calculate the area between curves when f(x) > g(x) on [a, c] and g(x) > f(x) on [c, b]?

Area=∫ac(f(x)−g(x)),dx+∫cb(g(x)−f(x)),dx\text{Area} = \int_{a}^{c} (f(x) - g(x)) , dx + \int_{c}^{b} (g(x) - f(x)) , dxArea=∫ac​(f(x)−g(x)),dx+∫cb​(g(x)−f(x)),dx

What is the general form of the antiderivative of xnx^nxn?

∫xn,dx=xn+1n+1+C\int x^n , dx = \frac{x^{n+1}}{n+1} + C∫xn,dx=n+1xn+1​+C, where n≠−1n \neq -1n=−1

What is the formula for the area between two curves if the integral is with respect to y?

Area=∫cd∣f(y)−g(y)∣,dy\text{Area} = \int_{c}^{d} |f(y) - g(y)| , dyArea=∫cd​∣f(y)−g(y)∣,dy, where x=f(y)x=f(y)x=f(y) and x=g(y)x=g(y)x=g(y)

What is the formula for the antiderivative of a polynomial?

∫(axn+bxm),dx=axn+1n+1+bxm+1m+1+C\int (ax^n + bx^m) , dx = a\frac{x^{n+1}}{n+1} + b\frac{x^{m+1}}{m+1} + C∫(axn+bxm),dx=an+1xn+1​+bm+1xm+1​+C

What is the formula for finding intersection points of two curves?

Set f(x)=g(x)f(x) = g(x)f(x)=g(x) and solve for xxx.

How do you express the definite integral with limits of integration?

∫abf(x),dx=F(b)−F(a)\int_{a}^{b} f(x) , dx = F(b) - F(a)∫ab​f(x),dx=F(b)−F(a), where F(x)F(x)F(x) is the antiderivative of f(x)f(x)f(x).

What is the formula to find the area between curves using vertical slices?

Area=∫ab(f(x)−g(x)),dx\text{Area} = \int_{a}^{b} (f(x) - g(x)) , dxArea=∫ab​(f(x)−g(x)),dx, where f(x)f(x)f(x) is the top function and g(x)g(x)g(x) is the bottom function.

How do you represent the area between two curves when integrating with respect to x?

Area=∫ab∣f(x)−g(x)∣,dx\text{Area} = \int_{a}^{b} |f(x) - g(x)| , dxArea=∫ab​∣f(x)−g(x)∣,dx

What is the formula for the area between curves when integrating with respect to y?

Area=∫cd∣h(y)−k(y)∣,dy\text{Area} = \int_{c}^{d} |h(y) - k(y)| , dyArea=∫cd​∣h(y)−k(y)∣,dy, where h(y)h(y)h(y) is the right function and k(y)k(y)k(y) is the left function.

Define definite integral.

A definite integral represents the area between a curve and the x-axis over a specified interval.

What are intersection points?

Points where two or more curves meet or cross each other.

Define area between curves.

The area enclosed by two or more curves within a given interval.

What is a vertical slice in area calculation?

A method where the area is approximated by thin vertical rectangles.

Define absolute value in the context of area between curves.

Ensures that the area calculated is always positive, regardless of which curve is 'above' or 'below'.

What does evaluating an integral mean?

Finding the numerical value of the definite integral, representing the area.

What is the significance of the interval [a, b]?

It defines the lower and upper bounds of the region for which the area between the curves is calculated.

Define the term 'points of intersection' in area between curves.

The x-values where two functions, f(x) and g(x), have the same y-value, i.e., f(x) = g(x).

What does it mean to set two equations equal to each other?

Finding the x-values where the y-values of both equations are the same, indicating intersection points.

Define 'unit^2' in the context of area.

The standard unit for measuring area, indicating that the area is a two-dimensional quantity.