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If sinalpha=(-3)/5, where pi<(alpha)<(3p...

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

A

1) `(-1)/sqrt10`

B

2) `(1)/sqrt10`

C

3) `(3)/sqrt10`

D

4) `(-3)/sqrt10`

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