HP HP-21 - Page 5

Function Keys .................. i 39
Finding Reciprocals ............. ... . ... ............ 39
Finding Square Roots ................................ 39
USINg T .. 40
Manual Storage Register ............................. 41
Storing and RecallingData ....................... 41
Storage Register Arithmetic ...................... 42
Trigonometric Functions ............................. 43
Polar/Rectangular Coordinate Conversion ............. 46
Logarithmic and Exponential Functions ............... 48
Logarithms ... .. ... ... ... .. ... 48
Raising Numbers to Powers ...................... 50
Afterword ... ... 52
Appendix A: Accessories, Service,
and Maintenance ............... i 53
Standard ACCESSOries ............coouiiiiiiiiiinann. 53
Optional ACCesSories ..., 53
Calculator Operation ......... .. .. ... i, 53
Battery Operation ......... ... ... .. .. .. .. .. . . ... 55
Battery Pack Replacement ............ .. ... .. ... ... ... 55
SeIVICE . 56
Low Power . ... ... . . 56
Blank Display ............. i 56
Temperature Range ......... ... .. ... . . . i 57
Warranty ... 57
In-Warranty ........ .. . ... ... 57
Out-of-Warranty ........... ... ... ... .. 57
Obligation to Make Changes ..................... 57
Shipping Instructions ......... ... ... .. .. 57
Appendix B: Improper Operations ................... 59
IndeX ..o 61