જો $\sin t + \cos t = \frac{1}{5}$ હોય,તો $\tan \frac{t}{2}$ ની કિંમત શું થાય?

  • A
    $-1$
  • B
    $-\frac{1}{3}$
  • C
    $2$
  • D
    $(b)$ અને $(c)$ બંને

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$\sin 20^\circ \sin 40^\circ \sin 60^\circ \sin 80^\circ = $

$\frac{\cot x - \tan x}{\cot 2x}$ ની કિંમત શું છે?

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