$n \in N$ 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 $x \sin^3 \alpha + y \cos^3 \alpha = \sin \alpha \cos \alpha$ और $x \sin \alpha - y \cos \alpha = 0$ है,तो $x^2 + y^2 = $

यदि $\sin A + \sin 2A = x$ और $\cos A + \cos 2A = y$ है,तो $({x^2} + {y^2})({x^2} + {y^2} - 3) = $

मान लीजिए $E = \left( 1 - \frac{\cos 61^\circ}{\cos 1^\circ} \right) \left( 1 - \frac{\cos 62^\circ}{\cos 2^\circ} \right) \dots \left( 1 - \frac{\cos 119^\circ}{\cos 59^\circ} \right)$,तो $E$ का मान ज्ञात कीजिए।

$(\sec A + \tan A - 1)(\sec A - \tan A + 1) - 2\tan A = $

सभी संभावित त्रिकों $(a_1, a_2, a_3)$ की संख्या ज्ञात कीजिए ताकि सभी $x$ के लिए $a_1 + a_2 \cos 2x + a_3 \sin^2 x = 0$ हो।

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