Shortcut Trick to Calculate Characteristic Equation of a matrix | Engineering Mathematics

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hello students ,
why to waste time in finding characteristic equation by determinant method if you guys have shortcut method .
In this video you will be able to find characteristic equation of a matrix within one minute .
this trick is helpful in finding eigen value of matrix and also in cayley hamilton theorem .
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Is there any shortcut to find characteristic equation for 5x5 matrix

taniyasharma
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Plz what is formula of charac. eq. of 4 by 4?

belatrix