$\cos \theta = \frac{b}{\sqrt{a^2 + b^2}}$; जहाँ,$0 < \theta < 90^\circ$; तो $\sin \theta = \dots$

  • A
    $\frac{a}{\sqrt{a^2 + b^2}}$
  • B
    $\frac{a}{b}$
  • C
    $\frac{b}{a}$
  • D
    $\frac{ab}{\sqrt{a^2 + b^2}}$

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$\cos (40^{\circ}-\theta)-\sin (50^{\circ}+\theta) = \ldots \ldots \ldots \ldots$

$9 \sec^{2} A - 9 \tan^{2} A = \dots$

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

Difficult
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$\frac{1}{\sin ^{2} \theta}-1 = \ldots \ldots \ldots$

व्यंजक $\left[\operatorname{cosec}(75^{\circ}+\theta)-\sec(15^{\circ}-\theta)-\tan(55^{\circ}+\theta)+\cot(35^{\circ}-\theta)\right]$ का मान है

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