Plane and Spherical Trigonometry: An Elementary Textbook

AB² acute angle of depression angle of elevation angles less axes circular measure congruent angles cos¹ cos² cos²x cosecant cot² cotangent csc² equal EXAMPLE EXERCISE expressed Find the height Find the remaining finds the angle fourth quadrant func functions of 30 given angle Hence hypotenuse Inverse trigonometric functions less than 90 Let the student logarithms magnitude obtained obtuse opposite perpendicular plane polar triangle positive direction proj projection Prove quadrant radius represent right angle right triangle sec² secant sin a cos sin a sin sin x sin² solution Solve the equation spherical angle spherical triangle subtends tan² tangent terminal lines theorem third quadrant three angles tions tower triangle ABC trigonometric functions values vertical X-axis π α π π