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If sinalphacosbeta = (-1)/(2), then find...

If `sinalphacosbeta = (-1)/(2)`, then find the range of value of `cosalphasinbeta`

A

`[-1/2,1]`

B

`[-1/2,0]`

C

`[-1/2,3/2]`

D

`[-1,1]`

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The correct Answer is:
A
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