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  1. AP Calculus
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Differential Equations

Question 1
college-boardCalculus AB/BCAPExam Style
1 mark

Given a differential equation dydx=cos⁡(x)−sin⁡(y)\frac{dy}{dx} = \cos(x) - \sin(y)dxdy​=cos(x)−sin(y), if one uses Euler's method starting from (π,π4)( \pi, \frac{\pi}{4} )(π,4π​) with a step size of π12\frac{\pi}{12}12π​, what is the approximate value of y(5π6)y( \frac{5\pi}{6} )y(65π​)?

Question 2
college-boardCalculus AB/BCAPExam Style
1 mark

Given the differential equation dydx=−xy\frac{dy}{dx} = -xydxdy​=−xy, if applying Euler's method starting from (2,−4)(2,-4)(2,−4) with a step size of .5.5.5, what would be the estimated value for y at x = 2.52.52.5?

Question 3
college-boardCalculus AB/BCAPExam Style
1 mark

What result does applying the Ratio Test to the infinite series ∑n=0∞n!(kn)!\sum_{n=0}^{\infty} \frac{n!}{(kn)!}∑n=0∞​(kn)!n!​ yield if k is a positive integer greater than one?

Question 4
college-boardCalculus AB/BCAPExam Style
1 mark

Which statement describes Euler's Method's role in numerically solving differential equations?

Question 5
college-boardCalculus AB/BCAPExam Style
1 mark

In terms of computational steps, what does one iteration of Euler's Method involve?

Question 6
college-boardCalculus AB/BCAPExam Style
1 mark

Given that ∣z∣=16cos⁡2θ+sin⁡2θ\left| z \right| = \sqrt{16 \cos^2 \theta + \sin^2 \theta}∣z∣=16cos2θ+sin2θ​, what is the magnitude of complex number zzz in rectangular form?

Question 7
college-boardCalculus AB/BCAPExam Style
1 mark

If a function f(x)f(x)f(x) is continuous and differentiable everywhere and Euler’s Method is used to approximate values along the curve, which statement best describes the reliability of the approximation?

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Question 8
college-boardCalculus AB/BCAPExam Style
1 mark

What is the first step in using Euler’s method to approximate a solution for a differential equation dydt=f(t,y)\frac{dy}{dt} = f(t, y)dtdy​=f(t,y) at a point (t0,y0)(t_0, y_0)(t0​,y0​) with step size hhh?

Question 9
college-boardCalculus AB/BCAPExam Style
1 mark

What does the 'h' represent in Euler's Formula yn+1=yn+hf(xn,yn)y_{n+1} = y_n + h f(x_n,y_n)yn+1​=yn​+hf(xn​,yn​)?

Question 10
college-boardCalculus AB/BCAPExam Style
1 mark

Given that function F defined as F(x,p,q)=p+q−pxF(x,p,q)=p+q−pxF(x,p,q)=p+q−px has unique equilibrium points determined by system ∂F∂p=p−qx=0, ∂F∂q=q−px=x2=0\frac{\partial F}{\partial p}=p−qx=0, \ \frac{\partial F}{\partial q}=q−px=x^2=0∂p∂F​=p−qx=0, ∂q∂F​=q−px=x2=0 for which pair (p,q)x(p,q)x(p,q)x within I=[−u,u]I=[-u,u]I=[−u,u] u>0u>0u>0 does euler path CCC beginning at c(−u,f(u))c(-u,f(u))c(−u,f(u)) not intersect any equilibrium points over domain D=[c−e,c+e]D=[c-e,c+e]D=[c−e,c+e], e>0e>0e>0 ?