यदि 0 le alpha , beta le 90^@ इस प्र...

यदि `0 le alpha , beta le 90^@` इस प्रकार हैं कि `cos (alpha - beta) = 1` है, तो `sin alpha – sin beta + cos alpha - cos beta` किसके बराबर है ?

A

`-1`

B

0

C

1

D

2

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