यदि $0 \leq A, B \leq \frac{\pi}{4}$ और $\cot A + \cot B + \tan A + \tan B = \cot A \cot B - \tan A \tan B$ है,तो $\sin(A + B) = $

  • A
    $0$
  • B
    $\frac{1}{2}$
  • C
    $\frac{1}{\sqrt{2}}$
  • D
    $\frac{\sqrt{3}}{2}$

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यदि $\alpha \in (0, \pi/2)$ है,तो $\sqrt{x^2 + x} + \frac{\tan^2 \alpha}{\sqrt{x^2 + x}} = \dots$

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$\text{cosec}10^{\circ} - \sqrt{3} \text{sec}10^{\circ}$ का मान किसके बराबर है:

यदि $\frac{\sqrt{2} \sin \alpha}{\sqrt{1+\cos 2 \alpha}}=\frac{1}{7}$ और $\sqrt{\frac{1-\cos 2 \beta}{2}}=\frac{1}{\sqrt{10}}$ जहाँ $\alpha, \beta \in (0, \frac{\pi}{2})$,तो $\tan (\alpha+2 \beta)$ का मान ज्ञात कीजिए।

यदि $\pi < \alpha < \frac{3\pi}{2}$ है,तो $\sqrt{\frac{1 - \cos \alpha}{1 + \cos \alpha}} + \sqrt{\frac{1 + \cos \alpha}{1 - \cos \alpha}} = $

फलन $f(x) = \cos x \cos(x + 2) - \cos^2(x + 1)$ का आलेख है

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