If $\tan \theta + \cot \theta = 2$,then $\sin \theta =$

  • A
    $\pm \frac{1}{2}$
  • B
    $\frac{1}{\sqrt{2}}$
  • C
    $\pm \frac{1}{3}$
  • D
    None of these

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Which of the following functions have the maximum value unity?

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