निम्नलिखित में से किस समीकरण का कोई हल नहीं है?

  • A
    $\sec \theta = 23$
  • B
    $\cos \theta = \sqrt{2}$
  • C
    $\tan \theta = 2019$
  • D
    $\sin \theta = -\frac{1}{5}$

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$\sin 50^\circ - \sin 70^\circ + \sin 10^\circ = $

$(\sin 210^{\circ})(\sin 585^{\circ})$ का मान क्या है?

$\tan \left(-\frac{23 \pi}{3}\right)-\cot \left(\theta-\frac{13 \pi}{3}\right) =$

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