श्रेणी $\cot^{-1} 3 + \cot^{-1} 7 + \cot^{-1} 13 + \cot^{-1} 21 + \dots$ के प्रथम $n$ पदों का योग क्या है?

  • A
    $\tan^{-1} \left( \frac{n}{n+2} \right)$
  • B
    $\cot^{-1} \left( \frac{n+2}{n} \right)$
  • C
    $\tan^{-1}(n+1) - \tan^{-1} 1$
  • D
    उपरोक्त सभी

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यदि $\sin^{-1} x + \cos^{-1} y = \frac{2\pi}{5}$ है,तो $\cos^{-1} x + \sin^{-1} y$ का मान क्या होगा?

मान ज्ञात कीजिए: $\cos^{-1}(\cos \frac{4\pi}{3}) + \sin^{-1}(\sin \frac{4\pi}{3}) = \dots$

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