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

If `A=[(cosalpha,-sinalpha),(sinalpha,cosalpha)]`, then `A+A'=1`, if the value of `alpha` is
a. π/ 6
b. π/ 3
c. π
d. 3 π/ 2

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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