math

how do I find the derivative of this?

r(t) = atcos3ti + bsin^3tj + ccos^3tk

it's a vector function and I know I have to find the derivative of each individually but I don't understand what to do with the a, b, or c.  t is the variable and i, j, and k are the vector notation thing....any help?

ignore a,b,c,i,j,k?  = treat them as constants (because they are), maybe?

i know to ignore i, j, and k but I didn't know what a, b, and c stood for.

constants, just like i j k...
what's so surprising about that?  Does abc depend on t?

i don't freaking know i suck at calc...

phail

i j and k aren't constants.
they're directions.
l2vectors

>>7
i = <1,0,0>
j = <0,1,0>
k = <0,0,1>

Tuples can have constants.
Therefore each tuple (read: letter representative of respective tuple) is a constant direction.