Elements of Plane and Spherical Trigonometry

angle apply B₁ B₂ C₁ called CHAPTER check formula circle colog computed convenient cos A sin cos B cos cos² cosine decreases definitions derived determine difference direction distance divided Draw equal equations EXAMPLES expressed feet figure formulæ four functions given greater Hence inches increases known less lines log a log log cos log cot log sin logarithms means measured method middle minutes Napier's negative opposite perpendicular places plane positive Prove quadrant radius ratio relations represent respectively revolves right angle right triangle rules sides signs sin A cos sin b sin sin² sine solution Solve spherical triangle student Substituting Subtracting taken tan² tangent third tions trigonometric functions true unknown values write