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this is a TI-89 titanium step-by-step program app for the derivative

of cos2x

for some function within the parenthesis there

to get to my main menu you have to press second alpha to enter the letters

i_n_d_e_x

and then press alpha again to enter the eight and the left and

right parenthesis

press enter into my menu

you have many choices in this menu of course

you can scroll way down

all alphabetical

equation of a tangent line

eliminate the parameter, dot product, cross product, whatever you need here

all step-by-step

all perfect

and we want to do

cosine derivative

scroll to that

uh… you have to press alpha before you enter anything in my

programs

and so we’re going to enter cosine

and let’s enter

rather than two _x

let’s enter _x

squared

I show you what you’ve entered so you can change it

and i say it’s okay

give you the chain rule formula, you write all of the

things down step-by-step calculations

on each screen

so you can get an _a in calculus

uh…

derivative of cosine of

_u is minus sine of _u

and here’s your answer

two times _x minus sine of _x squared

pretty neat huh?

everystepcalculus.com, go to my programs

enjoy my programs, and pass calculus

Tom Nygaard writes programs for Calculus and Physics for the TI-89 Series calculators at EveryStepCalculus.com and EveryStepPhysics.com. A retired professional trumpet player. He's also an avid tennis player and teacher residing in San Diego, California. Google+