Chapter 4: Q7E (page 186)

A nonhomogeneous equation and a particular solution are given. Find a general solution for the equation. $y'' = 2 y + 2 \tan^{3} x, y_{p} (x) = tanx$

Short Answer

Expert verified

The general solution of the given differential equation is $y = c_{1} e^{\sqrt{2} x} + c_{2} e^{- \sqrt{2} x} + tanx$ .

Step by step solution

Firstly, write the auxiliary equation of the given differential equation

The differential equation is,

$\begin{matrix} y'' = 2 y + 2 \tan^{3} x \\ y'' - 2 y = 2 \tan^{3} x \dots (1) \end{matrix}$

Write the homogeneous differential equation of the equation (1),

$y'' - 2 y = 0$

The auxiliary equation for the above equation,

$m^{2} - 2 = 0$

Now find the complementary solution of the given equation is

Solve the auxiliary equation,

$\begin{matrix} m^{2} - 2 = 0 \\ m = \pm \sqrt{2} \end{matrix}$

The roots of the auxiliary equation are,

$m_{1} = \sqrt{2}, & m_{2} = - \sqrt{2}$

The complementary solution of the given equation is,

$y_{c} = c_{1} e^{\sqrt{2} x} + c_{2} e^{- \sqrt{2} x}$

Use the given particular solution to find a general solution for the equation.

The given particular solution,

$y_{p} (x) = tanx$

Therefore, the general solution is,

$\begin{matrix} y = y_{c} (x) + y_{p} (x) \\ y = c_{1} e^{\sqrt{2} x} + c_{2} e^{- \sqrt{2} x} + tanx \end{matrix}$

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A nonhomogeneous equation and a particular solution are given. Find a general solution for the equation. $y'' = 2 y + 2 \tan^{3} x, y_{p} (x) = tanx$

Short Answer

Step by step solution

Firstly, write the auxiliary equation of the given differential equation

Now find the complementary solution of the given equation is

Use the given particular solution to find a general solution for the equation.

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A nonhomogeneous equation and a particular solution are given. Find a general solution for the equation. y''=2y+2tan3x, yp(x)=tanx

Short Answer

Step by step solution

Firstly, write the auxiliary equation of the given differential equation

Now find the complementary solution of the given equation is

Use the given particular solution to find a general solution for the equation.

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Math Textbooks

Theoretical and Mathematical Physics

Pure Maths

Logic and Functions

Discrete Mathematics

Decision Maths

Probability and Statistics

Study anywhere. Anytime. Across all devices.

A nonhomogeneous equation and a particular solution are given. Find a general solution for the equation. $y'' = 2 y + 2 \tan^{3} x, y_{p} (x) = tanx$