:/

Lots of typos lmao, sorry that this key is so bad.

1)

a. the answer i have is good. Or you could just do ratio test and say that 0<X

b. my answer is completely wrong, you are just suposed to do -x^2 (f(x)), This gives like cos(x) or something

c. g'(x) = cos(x)

d. take the integral