${\tan ^2}\theta + {\cot ^2}\theta$ का मान क्या है?

  • A
    $\ge 2$
  • B
    $\le 2$
  • C
    $\ge -2$
  • D
    इनमें से कोई नहीं

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$\sin 20^\circ \sin 40^\circ \sin 60^\circ \sin 80^\circ = $ ($/16$ में)

$(\sec 2A + 1){\sec ^2}A = $

$\frac{{\cot^2 15^\circ - 1}}{{\cot^2 15^\circ + 1}} = $

जब $\theta = 45^{\circ}$ हो, तो $(\sec \theta + \operatorname{cosec} \theta)$ का मान क्या होगा ($\sqrt{2}$ में)?

यदि $\cos x + \cos^2 x = 1$ है,तो $\sin^2 x + \sin^4 x$ का मान क्या होगा?

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