$\cos ^{2} 45^{\circ}-\sin ^{2} 15^{\circ}$ का मान क्या है?

  • A
    $\frac{\sqrt{3}}{2}$
  • B
    $\frac{\sqrt{3}}{4}$
  • C
    $\frac{\sqrt{3}+1}{2 \sqrt{2}}$
  • D
    $\frac{\sqrt{3}-1}{2 \sqrt{2}}$

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Similar Questions

यदि $\tan A=\frac{1}{\sqrt{x(x^2+x+1)}}, \tan B=\frac{\sqrt{x}}{\sqrt{x^2+x+1}}$ और $\tan C=\sqrt{x^{-1}+x^{-2}+x^{-3}}$ है,तो:

$tan\, 20^{\circ} + tan\, 40^{\circ} + \sqrt{3}\, tan\, 20^{\circ} tan\, 40^{\circ}$ का मान क्या है?

यदि $\theta$ और $\phi$ $1^{st}$ चतुर्थांश में ऐसे कोण हैं कि $\tan \theta = 1/7$ और $\sin \phi = 1/\sqrt{10}$ है,तो:

यदि $m \tan (\theta - 30^\circ) = n \tan (\theta + 120^\circ)$ है,तो $\frac{m + n}{m - n} = $

$\cos ^{2} 75^{\circ}+\cos ^{2} 45^{\circ}+\cos ^{2} 15^{\circ}-\cos ^{2} 30^{\circ}-\cos ^{2} 60^{\circ}$ का मान है

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