यदि $\tan A + \cot A = 2$ है,तो $\tan^{4} A + \cot^{4} A$ का मान क्या होगा?

  • A
    $2$
  • B
    $1$
  • C
    $4$
  • D
    $5$

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$n > 2$ के सभी संभावित पूर्णांक मानों की संख्या ज्ञात कीजिए ताकि $\sin \frac{\pi}{2n} + \cos \frac{\pi}{2n} = \frac{\sqrt{n}}{2}$ हो।

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