Plane Trigonometry

angle in standard angle of depression angle of elevation angles is equal approximate numbers B₁ called complex numbers computed cos¹ cos² cot² cotangent coterminal csc² decimal point Example EXERCISE expressed feet Find the angle Find the distance Find the height Find the value force fundamental identities gives graph Hence included angle integer interpolation inverse function inverse trigonometric functions law of cosines law of sines law of tangents left member length loga logarithms mantissa miles per hour multiply obtain plane pounds principal values quadrant angle radians radius real number reference position related angle right member right triangle rounded sec² secant significant figures sin x sin² sine and cosine Solution standard position tan-¹ tan² terminal side theorem three digits tion triangle ABC trigonometric equations trigonometric identities vector write x-axis zero