THIS IS MY EFFORT:
I just wanted to know if there are mistakes in my work...
THANKS FOR THOSE WHO WILL HELP ^_^
Those are correct. However, I notice that in using chain rule for the second problem, you have
while using direct substitution, you get
Those are, of course, the same because and so that
but the second, with only the variable t is the better expression.
oh yeah!! since it is with respect to t..thanks a lot for that one...
however, i am just wondering in my number 1 answer...try to take a look in Chain Rule the y=re^-s, are the derivatives under it are correct??