यदि $a \cos \theta + b \sin \theta = p$ और $a \sin \theta - b \cos \theta = q$ है,तो $a, b, p$ और $q$ के बीच का संबंध क्या है?

  • A
    $a^{2} - b^{2} = p^{2} - q^{2}$
  • B
    $a^{2} + b^{2} = p^{2} + q^{2}$
  • C
    $a + b = p + q$
  • D
    $a - b = p - q$

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