यदि एक समकोण त्रिभुज की भुजाएँ ${\cos2\alpha + \cos2\beta + 2\cos(\alpha + \beta )}$ और ${\sin2\alpha + \sin2\beta + 2\sin(\alpha + \beta )}$ हैं,तो कर्ण की लंबाई क्या है:

  • A
    $2[1+\cos(\alpha -\beta )]$
  • B
    $2[1 - \cos(\alpha+\beta )]$
  • C
    $4 \, \cos^2 \left( \frac{\alpha - \beta}{2} \right)$
  • D
    $(a)$ और $(c)$ दोनों

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