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+-- 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?).