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for the first one, u=cosx

second one u=2-3t

@lgbasallote Not for the first one

not necessarily but i like to do it so I don't miss the derivative of 2-3t...

me too...that formula is too confusing :/ kinda like doing limits to find derivative

from my caculation first one is 1/cosx+c
second one is -(2-3t)^7/21 +c is that right

i think there should be a negative on #1

*think*

#2 seems right though
@campbell_st whatis it with you and eggs :p

Second one is right. You just wrote it weird so it looks like the ^7 is getting divided by 21

why #1 is negative?