Question

@Michele_Laino

Answer 1

so you see it @Michele_Laino ?

Answer 2

i guess open question is better so then other people like me also can learn

Answer 3

I'm sorry, I don't see anything @Nnesha

Answer 4

sorry for what ?? i'm just saying
don't have to be sorry

Answer 5

ok!

Answer 6

yes :) please continue :)

Answer 7

@mondona opem a new question and don't close it

Answer 8

or just type whats in the pic ou t

Answer 9

is this?
integral between -1 and 1 of 1/(x^2+1)

Answer 10

its okay you can solve here :)

Answer 11

the result is:

Answer 12

arctan(1)-arctan(-1)=pi/4-(-pi/4)=pi/2

Answer 13

so the answer is pi/2?

Answer 14

yes!

Answer 15

what is it with three decimal places?

Answer 16

please note trhat:
pi=3.14159, so?

Answer 17

oops...note that...

Answer 18

what?

Answer 19

3.14159/2=...?

Answer 20

I got it without calculator!

Answer 21

answer=1.570