# Homework Help: Matlab Need Help

1. Mar 28, 2012

### alexparker17

Matlab Need urgent Help

1. The problem statement, all variables and given/known data
Create an appropriate vector 'x' and verify the equality of Right and Left hand sides of the expressions given above.

2. Relevant equations

Doing this by a/A=1 & b/B=1

3. The attempt at a solution

What i have done so far. But keep on getting this error at the bottom. Any help would be great

>> syms x
>> x=-10:1:10;
>> A=log(x+sqrt(x.^2.+1))

A =

Columns 1 through 13

-2.9982 -2.8934 -2.7765 -2.6441 -2.4918 -2.3124 -2.0947 -1.8184 -1.4436 -0.8814 0 0.8814 1.4436

Columns 14 through 21

1.8184 2.0947 2.3124 2.4918 2.6441 2.7765 2.8934 2.9982

>> B=log(x+sqrt(x.^2.-1))

B =

Columns 1 through 6

-2.9932 + 3.1416i -2.8873 + 3.1416i -2.7687 + 3.1416i -2.6339 + 3.1416i -2.4779 + 3.1416i -2.2924 + 3.1416i

Columns 7 through 12

-2.0634 + 3.1416i -1.7627 + 3.1416i -1.3170 + 3.1416i 0 + 3.1416i 0 + 1.5708i 0

Columns 13 through 18

1.3170 1.7627 2.0634 2.2924 2.4779 2.6339

Columns 19 through 21

2.7687 2.8873 2.9932

>> a;
??? Undefined function or variable 'a'.

>> A;
>> a=(exp(x)-exp(-x))/2;
>> b=(exp(x)+exp(-x))/2;
>> inv(a)
??? Error using ==> inv
Matrix must be square.

2. Mar 28, 2012