$n \in N$ 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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यदि $y^2+z^2=3yz$,$z^2+x^2=8zx$,और $x^2+y^2=4xy$ है,तो $\frac{y^2}{xz}+\frac{xz}{y^2}$ का मान ज्ञात कीजिए।

यदि $x = \log \left[ \cot \left( \frac{\pi}{4} + \theta \right) \right]$ है, तो $\sinh x$ का मान क्या है?

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