यदि $\cos \theta = \frac{3}{5}$ और $\cos \phi = \frac{4}{5}$ है,जहाँ $\theta$ और $\phi$ धनात्मक न्यून कोण हैं,तो $\cos \frac{\theta - \phi}{2} = $

  • A
    $\frac{7}{\sqrt{2}}$
  • B
    $\frac{7}{5\sqrt{2}}$
  • C
    $\frac{7}{\sqrt{5}}$
  • D
    $\frac{7}{2\sqrt{5}}$

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यदि $x + \frac{1}{x} = 2\cos \theta ,$ है,तो ${x^3} + \frac{1}{{{x^3}}} = $

यदि $A + B = 225^\circ$ है,तो $\frac{{\cot A}}{{1 + \cot A}} \cdot \frac{{\cot B}}{{1 + \cot B}} = $

$\sin^2 5^\circ + \sin^2 10^\circ + \sin^2 15^\circ + \dots + \sin^2 85^\circ + \sin^2 90^\circ$ का मान क्या है?

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