Select the correct options from the give...

Select the correct options from the given alternatives.If `alpha+beta+r=pi` then the value of `sin^2alpha+sin^2beta-sin^2r` is equal to……….

A

`2sinalpha`

B

`2sinalphacosbetasinx`

C

`2sinalphasinbetacosr`

D

`2sinalphasinbetasinx`

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