$n \in N$ માટે,જો $f(n) = (\cos nx)(\sec x)^n$ અને $g(n) = (\sin nx)(\sec x)^n$ હોય,તો $f(2020) - f(2019) + (\tan x)g(2019) =$

  • A
    $\sin x$
  • B
    $\cos x$
  • C
    $0$
  • D
    $1$

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જો $\sin x \cdot \cosh y = \cos \theta$ અને $\cos x \cdot \sinh y = \sin \theta$ હોય,તો $\sin^2 x + \cosh^2 y = $

જો $a$ અને $b$ અનુક્રમે વર્તુળમાં અંતર્ગત નિયમિત પંચકોણની બાજુ અને વિકર્ણની લંબાઈ દર્શાવતા હોય, તો $\frac{b}{a}=$

$\tan \frac{2 \pi}{7} \cdot \tan \frac{4 \pi}{7} + \tan \frac{4 \pi}{7} \cdot \tan \frac{\pi}{7} + \tan \frac{\pi}{7} \cdot \tan \frac{2 \pi}{7} = $

વિધેય $f(x) = \cos x \cos(x + 2) - \cos^2(x + 1)$ નો આલેખ શું છે?

Difficult
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$\left(1+\cos \frac{\pi}{8}\right)\left(1+\cos \frac{3 \pi}{8}\right)\left(1+\cos \frac{5 \pi}{8}\right)\left(1+\cos \frac{7 \pi}{8}\right)$ ની કિંમત શોધો.

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