यदि $2y \cos \theta = x \sin \theta$ और $2x \sec \theta - y \csc \theta = 3$ है,तो $x^2 + 4y^2 = $

  • A
    $4$
  • B
    $-4$
  • C
    $\pm 4$
  • D
    इनमें से कोई नहीं

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यदि $\cos \alpha = \operatorname{sech} \beta$ है,तो $\beta =$

यदि $\tan \beta = \cos \theta \tan \alpha$ है,तो ${\tan ^2}\frac{\theta }{2} = $

गुणनफल का मान ज्ञात कीजिए: $\left(1+\cos \frac{\pi}{8}\right)\left(1+\cos \frac{2 \pi}{8}\right)\left(1+\cos \frac{3 \pi}{8}\right)\left(1+\cos \frac{4 \pi}{8}\right)\left(1+\cos \frac{5 \pi}{8}\right)\left(1+\cos \frac{6 \pi}{8}\right)\left(1+\cos \frac{7 \pi}{8}\right)$

यदि $(\sec A + \tan A)(\sec B + \tan B)(\sec C + \tan C) = (\sec A - \tan A)(\sec B - \tan B)(\sec C - \tan C)$ है,तो प्रत्येक पक्ष का मान क्या होगा?

$1 + \cos 56^\circ + \cos 58^\circ - \cos 66^\circ = $

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