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Question
Find the value of the following:
sin 21° 21′
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Solution
| 0' | 6' | 12' | 18' | 24' | 30' | 36' | 42' | 48' | 54' | Mean difference | ||||||||
| 0.0° | 0.1° | 0.2° | 0.3° | 0.4° | 0.5° | 0.6° | 0.7° | 0.8° | 0.9° | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | |
| 49 | 0.7547 | |||||||||||||||||
From the natural cosines table
sin 21° 18′ = 0.3633
Mean difference 3' = 8
sin 21° 18′ = 0.3641
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