$\triangle ABC$ માં,જો $a \cos^2 \frac{C}{2} + c \cos^2 \frac{A}{2} = \frac{3b}{2}$ હોય,તો

  • A
    $2b = a + c$
  • B
    $b^2 = ac$
  • C
    $b^2 = \frac{2ac}{a+c}$
  • D
    $a + b + c = 1$

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કોઈપણ ત્રિકોણ $ABC$ માં,$\cos ^2 \frac{A}{2}+\cos ^2 \frac{B}{2}+\cos ^2 \frac{C}{2}$ નું મૂલ્ય શોધો.

ત્રિકોણ $ABC$ માં,જો $(a-b)^2 \cos^2 \frac{C}{2} + (a+b)^2 \sin^2 \frac{C}{2} = a^2 + b^2$ હોય,તો $\cos A =$

$\triangle ABC$ માં,જો $x=\tan \left(\frac{B-C}{2}\right) \tan \frac{A}{2}$,$y=\tan \left(\frac{C-A}{2}\right) \tan \frac{B}{2}$,અને $z=\tan \left(\frac{A-B}{2}\right) \tan \frac{C}{2}$ હોય,તો $(x+y+z)$ ની કિંમત શું થાય?

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