यदि $a \cos \theta + b \sin \theta = m$ और $a \sin \theta - b \cos \theta = n$ है,तो ${a^2} + {b^2} = $

  • A
    $m + n$
  • B
    ${m^2} - {n^2}$
  • C
    ${m^2} + {n^2}$
  • D
    इनमें से कोई नहीं

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$\tan 20^\circ \tan 40^\circ \tan 60^\circ \tan 80^\circ = $

$\tan 1^{\circ} \tan 2^{\circ} \tan 3^{\circ} \ldots \tan 89^{\circ}$ का मान क्या है?

$\sqrt{\frac{1+\cos \theta}{1-\cos \theta}}+\sqrt{\frac{1-\cos \theta}{1+\cos \theta}}=$

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