Chapter 1: Q30p (page 32)

$\sqrt{\frac{1 - x}{1 + x}}$

Short Answer

Expert verified

$\sqrt{\frac{1 - x}{1 + x}} = 1 - x + \frac{x^{2}}{2} - \frac{x^{3}}{2} + \dots$

Step by step solution

Given information

The Maclaurin expansion of the function $\sqrt{\frac{1 - x}{1 + x}}$ is to be evaluated.

Definition of Maclaurin series

The definition of the Maclaurin series is defined.

$(1 - x)^{1 / 2} = 1 - \frac{x}{2} - \frac{x^{2}}{8} - \frac{x^{3}}{16} + \dots$

$(1 + x)^{- 1 / 2} = 1 - \frac{x}{2} + \frac{3 x^{2}}{8} - \frac{5 x^{3}}{16} + \dots$

Part-A Step 3: Begin by stating the Maclaurin series

State the Maclaurin series.

$(1 - x)^{1 / 2} = 1 - \frac{x}{2} - \frac{x^{2}}{8} - \frac{x^{3}}{16} + \dots$

$(1 + x)^{- 1 / 2} = 1 - \frac{x}{2} + \frac{3 x^{2}}{8} - \frac{5 x^{3}}{16} + \dots$

Part-B Step 3: Use both Maclaurin series to evaluate

Use both Maclaurin series to evaluate.

$\sqrt{\frac{1 - x}{1 + x}} = (1 - x)^{1 / 2} \times (1 + x)^{- 1 / 2}$

$= [1 - \frac{x}{2} - \frac{x^{2}}{8} - \frac{x^{3}}{16} + \dots] \times [1 - \frac{x}{2} + \frac{3 x^{2}}{8} - \frac{5 x^{3}}{16} + \dots]$

$\sqrt{\frac{1 - x}{1 + x}} = 1 + \frac{- 256 x + 128 x^{2} - 128 x^{3} + \dots}{256}$

$\sqrt{\frac{1 - x}{1 + x}} = 1 - x + \frac{x^{2}}{2} - \frac{x^{3}}{2} + \dots$

Thus, the final answer is $\sqrt{\frac{1 - x}{1 + x}} = 1 - x + \frac{x^{2}}{2} - \frac{x^{3}}{2} + \dots$

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$\sqrt{\frac{1 - x}{1 + x}}$

Short Answer

Step by step solution

Given information

Definition of Maclaurin series

Part-A Step 3: Begin by stating the Maclaurin series

Part-B Step 3: Use both Maclaurin series to evaluate

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1-x1+x

Short Answer

Step by step solution

Given information

Definition of Maclaurin series

Part-A Step 3: Begin by stating the Maclaurin series

Part-B Step 3: Use both Maclaurin series to evaluate

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Physics Textbooks

Turning Points in Physics

Radiation

Astrophysics

Oscillations

Solid State Physics

Energy Physics

Study anywhere. Anytime. Across all devices.

$\sqrt{\frac{1 - x}{1 + x}}$