यदि $\cos 9 \alpha = \sin \alpha$ और $9 \alpha < 90^{\circ}$ है,तो $\tan 5 \alpha$ का मान ज्ञात कीजिए।

  • A
    $\frac{1}{\sqrt{3}}$
  • B
    $\sqrt{3}$
  • C
    $1$
  • D
    $0$

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'True' (सत्य) या 'False' (असत्य) लिखिए और अपने उत्तर का औचित्य बताइए।
व्यंजक $(\cos^{2} 23^{\circ} - \sin^{2} 67^{\circ})$ का मान धनात्मक है।

यदि $5 \cos A = 4 \sin A$,तो $\tan A = \ldots$

$\frac{\sec \theta-1}{\sec \theta+1} = \ldots$

$\Delta ABC$ में,$m \angle C = 90^{\circ}$ और $\cos B = \frac{1}{2}$ है,तो $\operatorname{cosec} A = \ldots$

सिद्ध कीजिए कि $\frac{1+\sec \theta-\tan \theta}{1+\sec \theta+\tan \theta}=\frac{1-\sin \theta}{\cos \theta}$

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