tlin - Printable Version +- HP Forums ( https://www.hpmuseum.org/forum)+-- Forum: HP Calculators (and very old HP Computers) ( /forum-3.html)+--- Forum: HP Prime ( /forum-5.html)+--- Thread: tlin ( /thread-998.html) |

tlin - dan_h - 03-29-2014 02:32 PM
A chapter in one of my calculus books covers using power series to solve differential equations. One example showed the following: cos(nx)*cos(jx) = 1/2(cos(jx-nx) + cos(jx+nx)). I tried working this trig identity on my Prime but couldn't until I came across the "tlin" command. tlin(cos(nx)*cos(jx)) = +([1/2*cos(jx-nx)1/2*cos(jx+nx)]) RE: tlin - dan_h - 04-02-2014 09:00 PM
"simplify" on the initial result will change it to the customary result: the plus sign between the 2 part of the answer, not preceding (RPN vestige?). |