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If A=[(sinalpha,-sinalpha),(sinalpha,cos...

If `A=[(sinalpha,-sinalpha),(sinalpha,cosalpha)]`, then `A+A'=I`, if the value of `alpha` is :

A

`pi/6`

B

`pi/3`

C

`pi`

D

`(3pi)/(2)`.

Text Solution

Verified by Experts

The correct Answer is:
B
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