यदि $A+B=45^{\circ}$ और $(\cot A-1)(\cot B-1)=4 K$ है,तो $K=$

  • A
    $\frac{1}{4}$
  • B
    $\frac{1}{8}$
  • C
    $\frac{1}{2}$
  • D
    इनमें से कोई नहीं

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यदि $y = 3\,\sin\,x + 4\,\cos\,x$ है,तो $y$ का अधिकतम मान ज्ञात कीजिए।

$\frac{{\sqrt 2 - \sin \alpha - \cos \alpha }}{{\sin \alpha - \cos \alpha }} = $

यदि $\sec \theta - \tan \theta = \frac{a+1}{a-1}$ है,तो $\cos \theta =$

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