समीकरणों $\sin x + \sin y = \sin (x + y)$ और $|x| + |y| = 1$ को संतुष्ट करने वाले $(x, y)$ युग्मों की संख्या है

  • A
    $2$
  • B
    $4$
  • C
    $6$
  • D
    $\infty$

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