જો $90^\circ < A < 180^\circ$ અને $\sin A = \frac{4}{5}$ હોય,તો $\tan \frac{A}{2}$ ની કિંમત શોધો.

  • A
    $1/2$
  • B
    $3/5$
  • C
    $3/2$
  • D
    $2$

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$\cos \left(\frac{2 \pi}{7}\right) + \cos \left(\frac{4 \pi}{7}\right) + \cos \left(\frac{6 \pi}{7}\right)$ ની કિંમત શોધો.

જો $\tan \theta = \frac{1}{3}$ હોય,તો $\cos 2 \theta = $

$\frac{1-\sin \theta+\cos \theta}{1-\sin \theta-\cos \theta} = $

જો $\cos 40^\circ = x$ અને $\cos \theta = 1 - 2x^2$ હોય,તો $0^\circ$ અને $360^\circ$ ની વચ્ચે $\theta$ ના શક્ય મૂલ્યો કયા છે?

$2\sin A\cos^3 A - 2\sin^3 A\cos A = $

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