જો $A+B+C=\frac{3 \pi}{2}$ હોય,તો $4 \sin A \sin B \sin C+\cos 2 A+\cos 2 B+\cos 2 C=$

  • A
    $-\sin (A+B+C)$
  • B
    $\cos (A+B+C)$
  • C
    $\sin (A+B+C)$
  • D
    $2-\cos (A+B+C)$

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$5 \sin^2 \theta + 4 \cos^2 \theta$ ની ન્યૂનતમ કિંમત શું છે?

જો $\alpha+\beta+\gamma=2 \theta$ હોય,તો $\cos \theta+\cos (\theta-\alpha)+\cos (\theta-\beta)+\cos (\theta-\gamma)$ ની કિંમત શોધો.

જો $A + B = \pi / 2$ હોય,તો $\cos A \cos B$ ની મહત્તમ કિંમત કેટલી થાય?

જો $A+B+C=\frac{\pi}{2}$ હોય,તો $\sqrt{2} \cos \left(\frac{\pi}{4}-A\right)+\sqrt{2} \cos \left(\frac{\pi}{4}-B\right)+\sqrt{2} \cos \left(\frac{\pi}{4}-C\right)+1=$

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