$\Delta ABC$ માં,$m \angle C = 90^{\circ}$ અને $\cos B = \frac{1}{2}$ હોય,તો $\operatorname{cosec} A = \ldots$

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

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જો $\triangle ABC$ માં $C$ આગળ કાટખૂણો હોય,તો $\cos(A + B)$ ની કિંમત શોધો.

$2 \sin ^{2} 30^{\circ} \cot 30^{\circ}-3 \cos ^{2} 60^{\circ} \sec ^{2} 30^{\circ} = \dots$

$\sin^{2} 15^{\circ} + \sin^{2} 75^{\circ} = \dots$

$\tan ^{2} \theta - \sec ^{2} \theta = \ldots \ldots \ldots$

$\tan 23^{\circ} \tan 42^{\circ} \tan 48^{\circ} \tan 67^{\circ} = \ldots \ldots \ldots \ldots .$

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