The Elements of Plane Trigonometry

1+tan a+ß acute angle adapted to logarithmic adjacent angles altitude angular base celestial sphere centre chord circ circle of latitude circular measure colog complement cosecant cosine cotangent csc q ctn A ctn deduce denote direction distance equator Example feet find the angle find the functions following angles formulas geometry Given a leg given angle horizon hypothenuse initial line less than 180 log csc log ctn log sin logarithms meas miles negative numerically obtained oc"B perp perpendicular Plane Trig positive Prove quad quadrant right angle right triangle secant sin a sin sin² sine and cosine solution solve spherical triangle straight line substituting tan² tangent terminal line tions triangle of reference trigonometric functions values vertex α α ов