How to Create a Tridiagonal Matrix with Lambda Values in Latex?

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flufypancakes
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take home exam urgent latex help!

hi! i don't know anything about latex, but i need pictures a matrix:

it is a tridiagonal matrix with (1-2lambda) on the main diagonal (except for the last row where it's 1-lambda) and lambdas above and below:

[(1-2*lambda) lambda 0 0 ........ 0]

[lambda (1-2*lambda) lambda 0 0 ...... 0]

[ 0 lambda (1-2*lambda) lambda 0 ... 0 ]

[ 0 \ \ \ 0 ]

...

[ 0 ......... lambda (1-lambda)]



please help, can't focus on actual problems because of these silly things. any format will do: ,jpg, .png, .pdf, ... anything or just the latex code.
 

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Welcome to PF fluffy,

Google for 'latex arrays' and you should find a number of appropriate tutorials.