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If A=[{:(1,2,3),(3,-2,1),(4,2,1):}] then...

If `A=[{:(1,2,3),(3,-2,1),(4,2,1):}]` then show that `A^(3)-23A-40I=O`

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MODERN PUBLICATION-SAMPLE PAPER 2019-EXERCISE
  1. Solve: 2tan^(-1)(sinx)=tan^(-1)(2secx),x!=pi/2.

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  2. Prove that : "cos"^(-1) ((b+a "cos"x)/(a+b "cos"x)) =2"tan"^(-1)(sqr...

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  3. If A=[{:(1,2,3),(3,-2,1),(4,2,1):}] then show that A^(3)-23A-40I=O

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