## Sunday, August 26, 2018

### HP 12C Platinum: Cosine of an Angle

HP 12C Platinum:  Cosine of an Angle

Introduction

This is a fairly short program of an angle.  The angle is in radians.  This is adapted from the TI-84 Plus COSRAD program from the book Inside Your Calculator (see Source section below).

HP 12C Platinum Program:  Cosine of an Angle

The angle is entered in radians.  This program can be adopted for the regular HP 12C.

 Step Key Code Key Comment 001 44, 0 STO 0 Begin program 002 2 2 003 21 y^x You could use x^2 on the Platinum 004 4 4 005 2 2 006 9 9 007 4 4 008 9 9 009 6 6 010 7 7 011 2 2 012 9 9 013 6 6 014 10 ÷ 015 44, 1 STO 1 016 1 1 Set counter 017 6 6 018 44, 2 STO 2 019 4 4 Loop begins 020 45, 1 RCL 1 021 30 - 022 45, 1 RCL 1 023 20 * 024 44, 1 STO 1 025 1 1 026 44, 30, 2 STO- 2 Decrease counter 027 45, 2 RCL 2 028 43, 35 x=0 029 43, 33, 031 GTO 031 030 43, 33, 019 GTO 019 031 1 1 032 45, 1 RCL 1 033 2 2 034 10 ÷ 035 30 - 036 43, 33, 000 GTO 000

Examples (FIX 6 setting):

cos 0.445 ≈ 0.902611
cos 2 ≈ -0.416147
cos -4.180 ≈ -0.507593
cos π/6 ≈ cos 0.523599 ≈ 0.866025

Source:

Gerald R. Rising.  Inside Your Calculator:  From Simple Programs to Significant Insights  Wiley-Interscience, John Wiley & Sons, Inc: Hoboken, New Jersey.  2007. ISBN 978-0-470-11401-8

Eddie

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