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20D - Homework Assignment 1 - UCSD Mathematics

Brian Bowers (TA for Hui Sun)MATH 20 DHomework Assignment 1 October 7, 201320D - Homework Assignment #1,2,3,4,6 Solve the given differential equation.(1)y =x2/y(2)y =x2/y(1 +x3)(3)y +y2sinx= 0(4)y = (3x2 1)/(3 + 2y)(6)xy = (1 y2)1/2 All of the equations in this set are separable, so our goal should be to get the terms involvingyon theleft side and the terms involvingxon the right side. I will rewritey asdy/dxfor these problems.(1)We separate and then integrate:dydx=x2/y= ydy=x2dx[separating variables]= y22=x33+C[integrating]= y= 2x33+C[solving fory](2)We separate and then integrate:dydx=x2/y(1 +x3)= ydy=x21 +x3dx[separating variables]= y22=13ln|1 +x3|+C[integrating]= y= 23ln|1 +x3|+C[solving fory](3)We separate and then integrate:dydx= y2sinx= dyy2= sinxdx[separating variables]= 1y= cosx+C[integrating]= y= 1cosx+C[solving fory]1(4)We separate and th

(6) xy0= (1 y2)1=2 All of the equations in this set are separable, so our goal should be to get the terms involving yon the left side and the terms involving xon the right side.

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