यदि $\sin \theta + \cos \theta = 1$ है,तो $\sin \theta \cos \theta = $

  • A
    $0$
  • B
    $1$
  • C
    $2$
  • D
    $0.5$

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

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यदि $x = \sec \phi - \tan \phi$ और $y = \csc \phi + \cot \phi$ है,तो निम्नलिखित में से कौन सा सत्य है?

${\left( {\frac{{\cos A + \cos B}}{{\sin A - \sin B}}} \right)^n} + {\left( {\frac{{\sin A + \sin B}}{{\cos A - \cos B}}} \right)^n}$ ($n$ सम या विषम है) $=$

$\frac{\sin \theta + \sin 2\theta }{1 + \cos \theta + \cos 2\theta } = $

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