જો $\sin A + \cos A = \sqrt{2}$ હોય,તો $\cos^2 A = $

  • A
    $\frac{1}{4}$
  • B
    $\frac{1}{2}$
  • C
    $\frac{1}{\sqrt{2}}$
  • D
    $\frac{3}{2}$

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