${\sin ^{ - 1}}\frac{4}{5} + 2{\tan ^{ - 1}}\frac{1}{3} = $

  • A
    $\frac{\pi }{2}$
  • B
    $\frac{\pi }{3}$
  • C
    $\frac{\pi }{4}$
  • D
    इनमें से कोई नहीं

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$\triangle ABC$ में,यदि $\angle A = 90^{\circ}$ है,तो $\cos^{-1}\left(\frac{R}{r_2+r_3}\right)$ का मान क्या होगा ($^{\circ}$ में)?

त्रिकोणमितीय समीकरण $\sin ^{-1} x = 2 \sin ^{-1} 2a$ का वास्तविक हल है, यदि

$\tan \left[2 \tan ^{-1}\left(\frac{1}{5}\right)-\frac{\pi}{4}\right]$ का मान है

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

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