નીચેનામાંથી કયું શક્ય છે?

  • A
    $\sin \theta = \frac{a^{2}+b^{2}}{a^{2}-b^{2}}, (a \neq b)$
  • B
    $\sec \theta = \frac{4}{5}$
  • C
    $\tan \theta = 45$
  • D
    $\cos \theta = \frac{7}{3}$

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નીચેનામાંથી કયો સંબંધ શક્ય છે?

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$\cot (45^\circ + \theta ) \cot (45^\circ - \theta ) = $

$\frac{\sin ^2(-160^{\circ})}{\sin ^2 70^{\circ}} + \frac{\sin (180^{\circ}-\theta)}{\sin \theta} = $

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