निम्नलिखित में से कौन सी संख्या/संख्याएँ परिमेय हैं?

  • A
    $\sin 15^\circ$
  • B
    $\cos 15^\circ$
  • C
    $\sin 15^\circ \cos 15^\circ$
  • D
    $\sin 15^\circ \cos 75^\circ$

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$\cot\, x + \cot\, (60^\circ + x) + \cot\, (120^\circ + x)$ का मान ज्ञात कीजिए:

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