यदि $(1+\tan ^{2} \theta)=\frac{625}{49}$ और $\theta$ न्यूनकोण है,तो $\sqrt{\sin \theta+\cos \theta}$ का मान क्या है?

  • A
    $1$
  • B
    $\frac{5}{4} \sqrt{\frac{31}{42}}$
  • C
    $\frac{\sqrt{31}}{5}$
  • D
    $\frac{5}{7}$

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$\sin ^{2} 30^{\circ} \cos ^{2} 45^{\circ}+5 \tan ^{2} 30^{\circ}+\frac{3}{2}\sin ^{2} 90^{\circ}-3 \cos ^{2} 90^{\circ}$ का मान ज्ञात कीजिए।

यदि $A + B + C = 180^o$ है,तो $\frac{\tan A + \tan B + \tan C}{\tan A \cdot \tan B \cdot \tan C} = $

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