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प्रश्न
Use tables to find cosine of 9° 23’ + 15° 54’
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उत्तर
cos (9° 23’ + 15° 54’) = cos 24° 77’
= cos 25° 17’
= cos (25° 12’ + 5’)
= 0.9048 − 0.0006
= 0.9042
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