MCQ
Which of the following functions have the maximum value unity ?
  • A
    $sin^2 x - cos^2 x$
  • B
    $\frac{{\sin \,2x\,\, - \,\,\cos \,2x}}{{\sqrt 2 }}$
  • C
    $-\frac{{\sin \,2x\,\, - \,\,\cos \,2x}}{{\sqrt 2 }}$
  • All of the above

Answer

Correct option: D.
All of the above
d

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