HP 33s hp 33s_user's manual_English_E_HDPM20PIE56.pdf - Page 317

You can press — or ˜ (or of the stack and recall them. and | ) to review the entire contents However, in normal operation in ALG mode, the stack in ALG mode differs from the one in RPN mode. (Because when you press ‘, the result is not placed into X1, X2 etc.) Only after evaluating equations, programs, or integrating equations, the values of the four registers will be the same as in RPN mode. Coordinate Conversions To convert between rectangular and polar coordinates: 1. Enter the coordinates (in rectangular or polar form) that you want to convert. In ALG mode, the order is y [ x or θ [ r. 2. Execute the conversion you want: press { r (rectangular-to-polar) or | s (polar-to-rectangular). The converted coordinates occupy the X- and Y-registers. 3. The resulting display (the X-register) shows either r (polar result) or x (rectangular result). Press š to see θ or y. Example: If x = 5, y = 30, what are r, θ ? Keys: Display: Ÿ {} 30 [ 5 { r š   8´θ8T T/ )  8´θ8T θ/ )  If r = 25, θ = 56, what are x, y ? Keys: Display: Ÿ {} 56 [ 25 | s   8´¸8º %/)  Description: Sets Degrees mode. Calculates hypotenuse (r). Displays θ. Description: Sets Degrees mode. Calculates x. ALG: Summary C-7