$3(\sin x-\cos x)^{4}+6(\sin x+\cos x)^{2}+4(\sin ^{6} x+\cos ^{6} x)$ का मान क्या है?

  • A
    $12$
  • B
    $13$
  • C
    $14$
  • D
    $11$

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यदि $\cos \theta - \sin \theta = \sqrt{2} \sin \theta$ है,तो $\cos \theta + \sin \theta$ का मान ज्ञात कीजिए।

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