Symbolic Calculus 50g  Printable Version + HP Forums (https://archived.hpcalc.org/museumforum) + Forum: HP Museum Forums (https://archived.hpcalc.org/museumforum/forum1.html) + Forum: Old HP Forum Archives (https://archived.hpcalc.org/museumforum/forum2.html) + Thread: Symbolic Calculus 50g (/thread162526.html) 
Symbolic Calculus 50g  Shu Y Pong  01282010 I am trying to figure out how to get the 50g to take the time derivatives symbolicly for r in dynamics problems. so r dot and r double dot as a function of theta. So the question is, is there a way to make the calculator see theta symbolicly as some unknown function of time instead of as a constant so that when it takes the derivative it executes the chain rule as it would if theta were a function instead of getting zero because it thinks theta is a constant. for instance if r = sin(theta) then r dot = cos(theta)*theta dot. instead the calculator just gives zero or if you take it with respect to theta then you just get cos(theta)
Edited: 28 Jan 2010, 8:43 p.m.
Re: Symbolic Calculus 50g  Norman Dziedzic  01282010 You have to tell the calculator that theta is a function of t. If you type in d/dt( cos ( theta(t) ) ) then you will get the result you expect. I get
cos( theta(t) ) * d1 theta(t)
