यदि $\sin \alpha$ और $\cos \alpha$ समीकरण $ax^2 + bx + c = 0$ $(c \neq 0)$ के मूल हैं,तो:

  • A
    $a^2 - b^2 + 2ac = 0$
  • B
    $(a + c)^2 = b^2 - c^2$
  • C
    $a^2 + b^2 - 2ac = 0$
  • D
    $(a - c)^2 = b^2 + c^2$

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यदि $A + B + C = 180^\circ$ है,तो $\sum \tan \frac{A}{2} \tan \frac{B}{2} = $

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