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Let n ge 2 bet an integer, A=((cos(2pi//...

Let `n ge 2` bet an integer, `A=((cos(2pi//n),sin(2pi//n),0),(-sin(2pi//n),cos(2pi//n),0),(0,0,1))` and `l` is the identity matrix of order 3. Then

A

`A^(n)=I` and `A^(n-1) ne I`

B

`A^(m) ne I` for any positive integer m

C

A is not invertible

D

`A^(m)=0` for a positive integer m

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WB JEE PREVIOUS YEAR PAPER-QUESTION PAPER 2014-MULTIPLE CHOICE QUESTIONS
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