Which of the following functions have the maximum value unity ?
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
$-\frac{{\sin \,2x\,\, - \,\,\cos \,2x}}{{\sqrt 2 }}$
- D
All of the above
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