$n \in N$ के लिए,यदि $f(n) = (\cos nx)(\sec x)^n$ और $g(n) = (\sin nx)(\sec x)^n$ है,तो $f(2020) - f(2019) + (\tan x)g(2019) =$

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

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Similar Questions

$\left(4 \cos ^2 \frac{\pi}{20}-1\right)\left(4 \cos ^2 \frac{3 \pi}{20}-1\right)\left(4 \cos ^2 \frac{5 \pi}{20}+1\right)\left(4 \cos ^2 \frac{7 \pi}{20}-1\right)\left(4 \cos ^2 \frac{9 \pi}{20}-1\right)=$

यदि $3 \sin (\alpha-\beta)=5 \cos (\alpha+\beta)$ और $\alpha+\beta \neq \frac{\pi}{2}$ है,तो $\frac{\tan \left(\frac{\pi}{4}-\alpha\right)}{\tan \left(\frac{\pi}{4}-\beta\right)}=$

$2 \sin(\frac{\pi}{8}) \sin(\frac{2\pi}{8}) \sin(\frac{3\pi}{8}) \sin(\frac{5\pi}{8}) \sin(\frac{6\pi}{8}) \sin(\frac{7\pi}{8})$ का मान है:

$\sec {50^o} + \tan {50^o}$ का मान क्या है?

$\cot 12^{\circ} \cot 102^{\circ} + \cot 102^{\circ} \cot 66^{\circ} + \cot 66^{\circ} \cot 12^{\circ}$ का मान ज्ञात कीजिए।

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