त्रिकोणमितीय अंतर्संबंधों के लिए निम्नलिखित में से कौन सा युग्म सही है?
$1. \cos \theta$ $a. \frac{\cos \theta}{\sin \theta}$
$2. \tan \theta$ $b. \frac{1}{\csc \theta}$
$3. \cot \theta$ $c. \frac{1}{\sec \theta}$
$4. \sin \theta$ $d. \frac{1}{\cot \theta}$
$e. \sin \theta \cdot \cos \theta$

  • A
    $(1-e), (2-b), (3-c), (4-d)$
  • B
    $(1-d), (2-e), (3-b), (4-a)$
  • C
    $(1-b), (2-a), (3-e), (4-d)$
  • D
    $(1-c), (2-d), (3-a), (4-b)$

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यदि $\triangle ABC$ में $C$ पर समकोण है,तो $\cos(A + B)$ का मान ज्ञात कीजिए।

यदि $\sin 70^{\circ} = \cos \theta$ है,तो $\theta = \ldots \ldots \ldots \ldots$ ($^{\circ}$ में)

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