• Abscissa, 94

  • Absolute inequality, 471

  • Absolute value, 4; of complex numbers, 354; in inequalities, 486

  • Accuracy of number, 13, 122

  • Addition: of algebraic expressions, 29; of complex numbers, 349; of fractions, 204; of matrices, 441; of ordinates, 316; of ­radicals, 336; of signed numbers, 7; of vectors, 265, 272

  • Adjacent angles, 56

  • Algebraic expressions, 29

  • Alternate-exterior angles, 56

  • Alternate-interior, angles, 56

  • Alternating current, 314, 364

  • Altitude, 59

  • Ambiguous case, 288

  • Ampere, 367

  • Amplitude of sine curve, 301

  • Analytic geometry, 568

  • Angle, 55, 114; acute, 55; central, 69; of depression, 129; of elevation, 129; inscribed, 70; negative, 114, 247; obtuse, 55; phase, 306; quadrantal, 115, 242; reference, 243; right, 55; standard position, ...

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