A Practical Text-book on Plane and Spherical Trigonometry

according acute angle adjacent angle application base calculated called circle corresponding cos a cos cos² cosc Cosine Cotang decimal definitions denote derived determined difference distance Dividing elements equal equation evident example expressed figure find the values formulæ formulæ of Art functions Geometry Given giving greater than 90 Hence increases less than 90 log cos log cosec log sin logarithm mantissa method middle negative Note observation obtained opposite angle perpendicular positive principle prove Putting quadrant radius relation remaining respectively right triangle rule sides Similarly sin A cos sin B sin sin² sinc Sine sins sinx siny solution spherical triangle Substituting subtract taken tanc Tang tangent theorem Trigonometry values Whence