જો $\cos \left(\frac{\alpha-\beta}{2}\right)=2 \cos \left(\frac{\alpha+\beta}{2}\right)$ હોય,તો $\tan \frac{\alpha}{2} \tan \frac{\beta}{2}=$

  • A
    $\frac{1}{2}$
  • B
    $\frac{1}{4}$
  • C
    $\frac{1}{3}$
  • D
    $\frac{1}{8}$

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જો $\theta \in \left(\frac{\pi}{2}, \frac{3 \pi}{2}\right)$ હોય, તો $\sqrt{4 \cos^{4} \theta + \sin^{2} 2 \theta} + 4 \cot \theta \cos^{2} \left(\frac{\pi}{4} - \frac{\theta}{2}\right)$ ની કિંમત શોધો.

જો $\cos \alpha + \cos \beta = a$ અને $\sin \alpha + \sin \beta = b$ હોય,તો List-$A$ માં આપેલી વસ્તુઓને List-$B$ માં તેમના મૂલ્યો સાથે જોડો.
List-$A$List-$B$
$(I)$ $\tan \left(\frac{\alpha + \beta}{2}\right) =$$(a)$ $\frac{b}{a}$
$(II)$ $\cos (\alpha + \beta) =$$(b)$ $\frac{2ab}{a^2 + b^2}$
$(III)$ $\sin (\alpha + \beta) =$$(c)$ $\frac{2ab}{a^2 - b^2}$
$(IV)$ $\tan (\alpha + \beta) =$$(d)$ $\frac{a^2 - b^2}{a^2 + b^2}$

$\operatorname{sech}^{-1}(\sin \theta)$ કોના બરાબર છે?

જો $\sin \beta$ એ $\sin \alpha$ અને $\cos \alpha$ વચ્ચેનો સમગુણોત્તર મધ્યક હોય,તો $\cos 2\beta$ બરાબર શું થાય?

જો $\text{cosec } A + \cot A = \frac{11}{2}$ હોય,તો $\tan A = $

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