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Tangent Cotangent Cosecant and Secant of Acute
Solution of RightAngled Triangles
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1+cos A+B+C A+sin A+tan aeroplane angle of elevation approx B—sin B+cos B+sin calculate circular measure cos2 cosec Cosine Rule cot A cot cotangent decimalised denoted distance equal equation Example Exercise Express Find the angles Find the height Find the value formula French Grammar given angle Gwyn Jones half-angle Hence horizontal hypotenuse in-circle integer changes length lies between 180 Logarithm miles nautical miles nearest minute negative angles numbers are italicised obtain obtuse parallax parsecs PÍcheur d'Islande perpendicular positive acute angles positive angles Pythagoras quadrants radians radius Referring to Fig result right angle right-angled triangle satisfy the data sec2 secant Sign Convention significant figures similarly Sine and Cosine Sine Rule small angle Solution of Triangles Solve the triangle subtends an angle SUBTRACT surd form tables tan2 tangent triangle ABC triangle whose sides triangle XYZ trigonometrical ratios