निम्नलिखित में से किन फलनों का अधिकतम मान इकाई $(1)$ है?

  • A
    $sin^2 x - cos^2 x$
  • B
    $\frac{\sin 2x - \cos 2x}{\sqrt{2}}$
  • C
    $-\frac{\sin 2x - \cos 2x}{\sqrt{2}}$
  • D
    उपरोक्त सभी

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