Find the distance between the pair of po...

Find the distance between the pair of points, `(a" sin "a,-b" cos "a)and(-a" cos "a,b" sin "a)`.

A

`sqrt(2)sqrt(a^(2)+b^(2))|"cos"(alpha-pi/(4))|`

B

`sqrt(2)sqrt(a^(2)+b^(2))|"cos"(alpha+pi/(4))|`

C

`sqrt(2)sqrt(a^(2)+b^(2))|"sin"(alpha-pi/(4))|`

D

`sqrt(a^(2)+b^(2))|"cos"(alpha-pi/(4))|`

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