Question

@perl

Answer 1

@perl

Answer 2

one moment

Answer 3

okay(:

Answer 4

sorry my computer is very slow , and working with another student

Answer 5

okkk

Answer 6

$$
\Large \int_{0}^{1} \frac{1}{2}~\pi (\frac{e^{-x}}{2}) ^2dx
\\ \Large = \frac{1}{16} \pi (1 - \frac{1}{e^2})
$$

Answer 7

yay i got it right(: thank you !