$(a-b)^2 \cos^2 \frac{C}{2} + (a+b)^2 \sin^2 \frac{C}{2}$ का मान क्या है?

  • A
    $c^2$
  • B
    $a^2+b^2$
  • C
    $a^2+b^2+c^2$
  • D
    $a^2-b^2+c^2$

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