Texas Instruments TI-89 User Manual - Page 936
Overview of Complex Numbers, Entering Complex Numbers
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Entering Complex Numbers You can enter complex numbers in the polar form (rù, q), where r is the magnitude and q is the angle, or polar form re iq. You can also enter complex numbers in rectangular form a+bi . Overview of Complex Numbers A complex number has real and imaginary components that identify a point in the complex plane. These components are measured along the real and imaginary axes, which are similar to the x and y axes in the real plane. The point can be expressed in rectangular form or in either of two polar The i symbol represents the imaginary numberÁ-1 . Imaginary a r θ Espressed as a+bi , re iq, or (rù, q). b Real As shown below, the form that you can enter depends on the current Angle mode. You can use the form: a+bi r ei q (r,ùq) When the Angle mode setting is: Radian, Degree or Gradian Radian only (In Degree or Gradian angle mode, this form causes a Domain error.) Radian, Degree or Gradian Use the following methods to enter a complex number. To enter the: Rectangular form a+bi Do this: Substitute the applicable values or variable names for a and b. a «Ç b 2 ) Note: To get the i symbol, press 2 ), do not simply type an alphabetic i. For example: To enter the: Do this: Appendix B: Technical Reference 937