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If sinalpha=(-3)/(5), where piltalphalt(...

If `sinalpha=(-3)/(5)`, where `piltalphalt(3pi)/(2)`, then `cos""(alpha)/(2)=?`

A

`-(1)/(sqrt(10))`

B

`(1)/(sqrt(10))`

C

`(3)/(sqrt10)`

D

`(-3)/(sqrt(10))`

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The correct Answer is:
A
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