ધારો કે $f(x) = \frac{\sin(x-a) + \sin(x+a)}{\cos(x-a) - \cos(x+a)}$,તો

  • A
    $f(x+2\pi) = f(x)$ પરંતુ કોઈપણ $0 < \alpha < 2\pi$ માટે $f(x+\alpha) \neq f(x)$
  • B
    $f$ એ ચુસ્ત વધતું વિધેય છે
  • C
    $f$ એ ચુસ્ત ઘટતું વિધેય છે
  • D
    $f$ એ અચળ વિધેય છે

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