हिंदी

cos^2 67° + cos^2 23° = ......

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प्रश्न

cos267° + cos223° = ......

रिक्त स्थान भरें
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उत्तर

cos267° + cos223° = 1.

Explanation:

cos267° + cos223° = cos267° + cos2(90° – 67°) 

= cos267° + sin267° 

= 1

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अध्याय 12: Trigonometric Ratios of Some Complemantary Angles - MULTIPLE-CHOICE QUESTIONS (MCQ) [पृष्ठ ५९४]

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आर.एस. अग्रवाल Mathematics [English] Class 10
अध्याय 12 Trigonometric Ratios of Some Complemantary Angles
MULTIPLE-CHOICE QUESTIONS (MCQ) | Q 21. (iii) | पृष्ठ ५९४
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