| 1. | Of those who added trigonometry, only 37 percent were prepared.
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| 2. | The apparent angle and true angle are related using trigonometry as:
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| 3. | Then the distance to the star could be calculated using trigonometry.
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| 4. | These are functions of an angle which are investigated in trigonometry.
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| 5. | The correct heading relative to the compass is calculated using trigonometry.
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| 6. | The formula is important because it connects complex numbers and trigonometry.
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| 7. | This formula is important because it relates complex numbers and trigonometry.
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| 8. | Muslim mathematicians developed spherical trigonometry which was used in these calculations.
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| 9. | Plotting altitude was more complex, as it required simple trigonometry.
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| 10. | During this time he continued to study spherical mathematics and trigonometry.
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