Posts: 253

Threads: 20

Joined: Jun 2012

The nSpire CAS reference I downloaded has a similar problem on page 36 at the top. The function of x associated with w (this example uses w as the variable instead of y?)is given as a fraction with denominator x, but NO NUMERATOR. This is what causes the error with that example. When I type your example verbatim in to my nSpire calculator page, it returns y= e^pi/3 * x * cos(3x) - e^pi/6 * x * sin(3x) + x*e^x, all of that over 10. It is VERY similar to the result given in the reference manual I have. I played with it for a while to see what numerator would give the answer in the manual, but gave up after an hour. If you figure it out, clue me in huh? It has been almost 30 years since my last Dif Eq class :(