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मान निकालिए sin25° cos65° + cos25° sin65° - Mathematics (गणित)

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Question

मान निकालिए sin25° cos65° + cos25° sin65°

Sum
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Solution

sin25° cos65° + cos25° sin65°

=(sin 25°) {cos(90°-25°)}+cos 25°{sin(90°-25)}

=(sin 25°)(sin 25°) + (cos 25°)(cos 25°)

= sin225° + cos225°

= 1 (As sin2A + cos2A = 1)

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त्रिकोणमितीय सर्वसमिकाएँ
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Chapter 8: त्रिकोणमिति का परिचय - प्रश्नावली 8.4 [Page 213]

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NCERT Ganit [Hindi] Class 10
Chapter 8 त्रिकोणमिति का परिचय
प्रश्नावली 8.4 | Q 3. (ii) | Page 213
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