यदि $A = \cos^2 \theta + \sin^4 \theta$ है,तो $\theta$ के सभी मानों के लिए:

  • A
    $1 \le A \le 2$
  • B
    $13/16 \le A \le 1$
  • C
    $3/4 \le A \le 13/16$
  • D
    $3/4 \le A \le 1$

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समीकरण $\sin^2 \theta = \frac{x^2 + y^2}{2xy}$,जहाँ $x, y \neq 0$,तब संभव है यदि

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यदि $\sin \theta = \frac{1}{2} \left( \sqrt{\frac{x}{y}} + \sqrt{\frac{y}{x}} \right)$,जहाँ $x, y \in \mathbb{R} - \{0\}$. तो:

यदि $A + B + C = \pi ,$ तो $\tan ^2 \frac{A}{2} + \tan ^2 \frac{B}{2} + \tan ^2 \frac{C}{2}$ हमेशा होता है

यदि $A + B + C = 180^{\circ}$ है,तो $\tan A + \tan B + \tan C = $

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यदि $A$ और $B$ पूरक कोण हैं,तो:

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