यदि $\tan ^{-1}\left(\frac{1}{4}\right)+\tan ^{-1}\left(\frac{2}{9}\right)=\frac{1}{2} \cos ^{-1} x$ है,तो $x$ का मान ज्ञात कीजिए।

  • A
    $\frac{1}{5}$
  • B
    $\frac{2}{5}$
  • C
    $\frac{3}{5}$
  • D
    $\frac{4}{5}$

Explore More

Similar Questions

यदि $\cos ^{-1} x+\cos ^{-1} y+\cos ^{-1} z=\pi$ और $x^2+y^2+z^2+k x y z=1$ है,तो $k$ का मान ज्ञात कीजिए।

$\cos \left(\cos ^{-1} \frac{1}{3}+\cos ^{-1} \frac{1}{5}\right)+\cos \left(\sin ^{-1} \frac{1}{3}+\sin ^{-1} \frac{1}{5}\right) =$ . . . . . . .

$\sum_{i=0}^2 \cot ^{-1}\{-(i+1)\}=$ . . . . . . .

यदि $f(x) = 2 \tan^{-1} x + \sin^{-1} \left( \frac{2x}{1 + x^2} \right)$,जहाँ $x > 1$,तो $f(5)$ का मान ज्ञात कीजिए:

$\frac{d}{dx} \sin^{-1}(3x - 4x^3)$ का मान ज्ञात कीजिए।

Vedclass Products

For Students

Vedclass Test Series

Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.

Start Free Trial
For Teachers

Exam Paper Generator

Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.

Try Free
For Institutes

Online Exam Module

Live online exams with unlimited students, 360° analytics & white-label branding.

See Demo