જો $\sin x + \sin y = \frac{1}{2}$ અને $\cos x + \cos y = 1$ હોય,તો $\tan(x + y) = $

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

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$\cos ^2\left(\frac{\pi}{6}+\theta\right)-\sin ^2\left(\frac{\pi}{6}-\theta\right)$ ની કિંમત શોધો.

જો $\alpha$ એ $3^{\text{rd}}$ ચરણમાં હોય,$\beta$ એ $2^{\text{nd}}$ ચરણમાં હોય અને $\tan \alpha = \frac{1}{7}$ તથા $\sin \beta = \frac{1}{\sqrt{10}}$ હોય,તો $\sin(2\alpha + \beta)$ ની કિંમત શોધો.

$\cos ^4 \frac{\pi}{24} - \sin ^4 \frac{\pi}{24} = $

જો $\cos(\alpha + \beta) = \frac{4}{5}$ અને $\sin(\alpha - \beta) = \frac{5}{13}$,જ્યાં $0 \le \alpha, \beta \le \frac{\pi}{4}$ હોય,તો $\tan 2\alpha = $

$\sin (x+y) \sec x \sec y=$

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