यदि $\cos^{-1} \left( \frac{x}{2} \right) + \cos^{-1} \left( \frac{y}{3} \right) = \theta$ है,तो $9 x^{2} - 12 x y \cos \theta + 4 y^{2} =$ क्या होगा?

  • A
    $36 \sin^{2} \theta$
  • B
    $37 \sin^{2} \theta$
  • C
    $39 \sin^{2} \theta$
  • D
    $36 \cos^{2} \theta$

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Similar Questions

श्रेणी $\tan^{-1}\left(\frac{1}{3}\right) + \tan^{-1}\left(\frac{2}{9}\right) + \dots + \tan^{-1}\left(\frac{2^{n-1}}{1+2^{2n-1}}\right) + \dots$ के अनंत पदों का योग ज्ञात कीजिए।

यदि $\frac{1}{2} \leq x \leq 1$ है,तो $\cos ^{-1} x+\cos ^{-1}\left(\frac{x}{2}+\frac{1}{2} \sqrt{3-3 x^2}\right)$ का मान ज्ञात कीजिए।

मान ज्ञात कीजिए: ${\tan ^{ - 1}}1 + {\tan ^{ - 1}}2 + {\tan ^{ - 1}}3$

यदि ${\tan ^{ - 1}}\frac{{x - 1}}{{x + 2}} + {\tan ^{ - 1}}\frac{{x + 1}}{{x + 2}} = \frac{\pi }{4}$,तो $x =$

यदि $\sin ^{-1}\left(x-\frac{x^2}{2}+\frac{x^3}{4}-\ldots \infty\right) + \cos ^{-1}\left(x^2-\frac{x^4}{2}+\frac{x^6}{4}-\ldots \infty\right)=\frac{\pi}{2}$ और $0 < x < \sqrt{2}$ है,तो $x$ का मान ज्ञात कीजिए।

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