Plane and Spherical Trigonometry

9 L cos 9 L cot acute angles angle increases angle of elevation approaches becomes called circle coincide colog considered convenient corresponding cos a cos cos x cos2 cosecant cosh cosine cot 9 cotangent decreases definitions denominator determined difference distance divided draw employed equal equation example EXERCISE expression figures formulas four Given greater height Hence hypotenuse known legs length less limit logarithm magnitude manner means measured method minute negative Note object observation obtained opposite perpendicular plane positive problem Prove radians radius relations remaining respectively revolving line right angle right triangle satisfy secant sides similar sin x sine sinh solution Solve spherical triangle given Substituting subtended tangent third tion tower trigonometric functions values пп