SSC CHSL Premium Mock 07 – Q073

Question:

In right-angled triangle ABC, ∠B = 90° and angle A and angle C are acute angles. If \(\operatorname{cosec} A = 2\sqrt{2}\), then find the value of \(\sin A \cos C + \cos A \sin C\).

समकोण त्रिभुज ABC में, ∠B = 90° तथा कोण A और कोण C न्यून कोण हैं। यदि \(\operatorname{cosec} A = 2\sqrt{2}\) है, तो \(\sin A \cos C + \cos A \sin C\) का मान ज्ञात कीजिए।

Options:

  • 0
  • 2√2
  • 1
  • √2
  • 0
  • 2√2
  • 1
  • √2

Correct Answer: c)

Explanation:

Using the trigonometric identity:

\[\sin A \cos C + \cos A \sin C = \sin(A + C)\]

In right triangle ABC with \(\angle B = 90^\circ\), the sum of acute angles is \(A + C = 90^\circ\).

Therefore:

\[\sin(A + C) = \sin 90^\circ = 1\]

Hence, option (c) is correct.

त्रिकोणमितीय सर्वसमिका का उपयोग करने पर:

\[\sin A \cos C + \cos A \sin C = \sin(A + C)\]

समकोण त्रिभुज ABC में जहाँ \(\angle B = 90^\circ\) है, \(A + C = 90^\circ\) होता है।

अतः \(\sin(A + C) = \sin 90^\circ = 1\)।

विकल्प (c) सही उत्तर है।

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