यदि $\frac{\pi}{2} \leq x \leq \frac{3 \pi}{4}$ है,तो $\cos ^{-1}\left(\frac{12}{13} \cos x+\frac{5}{13} \sin x\right)$ का मान ज्ञात कीजिए।

  • A
    $x-\tan ^{-1} \frac{4}{3}$
  • B
    $x-\tan ^{-1} \frac{5}{12}$
  • C
    $x+\tan ^{-1} \frac{4}{5}$
  • D
    $x+\tan ^{-1} \frac{5}{12}$

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$\cos ^{-1}\left\{\frac{1}{\sqrt{2}}\left(\cos \frac{9 \pi}{10}-\sin \frac{9 \pi}{10}\right)\right\}$ का मान ज्ञात कीजिए।

${(\sin ^{ - 1}}x)^3 + {(\cos ^{ - 1}}x)^3$ का अधिकतम और न्यूनतम मान ज्ञात कीजिए।

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यदि ${x^2} + {y^2} + {z^2} = {r^2}$ है,तो ${\tan ^{ - 1}}\left( {\frac{{xy}}{{zr}}} \right) + {\tan ^{ - 1}}\left( {\frac{{yz}}{{xr}}} \right) + {\tan ^{ - 1}}\left( {\frac{{zx}}{{yr}}} \right) = $

$\cos \left(\cos ^{-1}\left(-\frac{1}{4}\right)+\sin ^{-1}\left(-\frac{1}{4}\right)\right) = $ . . . . . . .

$\cot \left[\sum_{n=3}^{32} \cot ^{-1}\left(1+\sum_{k=1}^n 2 k\right)\right]=$

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