## Elements of Plane Trigonometry |

### From inside the book

Page 38

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**sin 2**4 ) — √ ( 1—**sin 2**4 ) } , - - we use the under sign as the angle is less than 45 ° . Now , in the above formula let A 9 ° , then , 2 A 1 sin 9 ° } { √ ( 1 + sin**18**° ) — √ ( 1 — sin**18**° ) } = 2 ― =**18**° , 5- - } { √ / ( 1 ...### Other editions - View all

### Common terms and phrases

1+tan AB² AC² angle ACB AP AP AP AP² ARITHMETIC Asin Atan B+cot centre circular measure circumference cos² cos³ cosec cosine cot 4+cot cot A cot cot² OCA diameter distance equal equation Euclid feet Find the number formula given GRAMMAR height Hence hexagon inscribed circle IVY LANE J. R. Young King's College School log blog logarithms nth root number of degrees number of sides perimeter perpendicular plane triangle quadrant radii radius ratio regular polygon Rudimentary Treatise sec² shew sin A cos sin A sin sin¹ sin2 sin² 18 sin³ sine and cosine square subtend subtracted T. H. L. Leary tan-¹ tan² tangent triangle ABC Trigonometry unity VIRTUE BROTHERS W. D. Hamilton

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