यदि $A = 580^\circ$ है,तो निम्नलिखित में से कौन सा सत्य है?

  • A
    $2 \sin \left( \frac{A}{2} \right) = \sqrt{1 + \sin A} - \sqrt{1 - \sin A}$
  • B
    $2 \sin \left( \frac{A}{2} \right) = -\sqrt{1 + \sin A} + \sqrt{1 - \sin A}$
  • C
    $2 \sin \left( \frac{A}{2} \right) = -\sqrt{1 + \sin A} - \sqrt{1 - \sin A}$
  • D
    $2 \sin \left( \frac{A}{2} \right) = \sqrt{1 + \sin A} + \sqrt{1 - \sin A}$

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यदि $\cos 40^\circ = x$ और $\cos \theta = 1 - 2x^2$ है,तो $0^\circ$ और $360^\circ$ के बीच $\theta$ के संभावित मान क्या हैं?

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