Thread: please help with a substitution problem

Evaluate the indefinite integral. (Enter your answer in terms of cos function.)



so far i have:

u = 4 t
du = dt

1/ du = dt

once you subsitute it all back in i get a final answer of:

(1/ )(cos4 t)+c

but this is not correct....
where is my mistake?

Originally Posted by rhcp1231

Evaluate the indefinite integral. (Enter your answer in terms of cos function.)



so far i have:

u = 4 t
du = dt -> False

1/ du = dt

once you subsitute it all back in i get a final answer of:

(1/ )(cos4 t)+c

but this is not correct....
where is my mistake?

Also note that

Originally Posted by Riyzar

Also note that

so is the answer:

-1/pi(cos(pi*t))+c
correct?

Originally Posted by rhcp1231

so is the answer:

-1/pi(cos(pi*t))+c
correct?

... you're forgetting the 4.