HP 35s HP 35s scientific calculator - User Guide - Page 118

Equation Functions The following table lists the functions that are valid in equations. Appendix G, "Operation Index" also gives this information. LN INV SGN SIN SINH DEG L KG SEED + sx xw LOG IP INTG COS COSH RAD GAL LB ARG - sy xˆ EXP FP IDIV TAN TANH HMS MILE °C RAND × σ x yˆ ALOG RND RMDR ASIN ASINH HMS KM °F π ÷ σ y r SQ ABS ACOS ACOSH %CHG nCr CM ^ x m SQRT ! ATAN ATANH XROOT nPr IN y b n Σx Σy Σx2 Σy2 Σxy For convenience, prefix-type functions, which require one or two arguments, display a left parenthesis when you enter them. The prefix functions that require two arguments are %CHG, XROOT, IDIV, RMDR, nCr and nPr. Separate the two arguments with a comma. In an equation, the XROOT function takes its arguments in the opposite order from RPN usage. For example, -83  to is equivalent to All other two argument functions take their arguments in the Y, X order used for RPN. For example, 28 4  x is equivalent to For two argument functions, be careful if the second argument is negative. These are valid equations: 6-16 Entering and Evaluating Equations