# Use a Taylor-Series expansion to estimate cos(π/4), with a=0.7 and using three terms (up to the h2 term).

*label*Science

*timer*Asked: Sep 5th, 2018

*account_balance_wallet*$20

### Question Description

1. Use a Taylor-Series expansion to estimate cos(π/4), with *a*=0.7 and using three terms (up to the *h*^{2} term).

2. Write "LSU" using 8-bit binary code. When you enter the answer, do not use any spaces in the full string.

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## Tutor Answer

The solution is attached in pdf and word format.Please, let me know if you need any clarification.

Question 1:

Use a Taylor-series expansion to estimate cos(𝜋/4), with 𝑎 = 0.7 and using three terms (up to

the ℎ2 term).

Solution

The Taylor series of a function 𝑓(𝑥) that is differentiable at a point 𝑎 is given by:

𝑓(𝑥) = 𝑓(𝑎) +

𝑓 ′ (𝑎)

𝑓 ′′ (𝑎)

𝑓 ′′′ (𝑎)

(𝑥 − 𝑎) +

(𝑥 − 𝑎)2 +

(𝑥 − 𝑎)3 + ⋯

1!

2!

3!

For the given problem:

𝑓(𝑥) = cos(𝑥)

𝑎 = 0.7

𝑓(𝑥) = cos(𝑥)

𝑓(𝑎) = cos(0.7) = 0.7648

𝑓 ′ (𝑥) = −sin(𝑥)

𝑓 ′ (𝑎) = − sin(0.7) = −0.6442

𝑓 ′′ (𝑥) = −cos(𝑥)

𝑓 ′′ (𝑎) = − cos(0.7) = ...

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