Question

WTF

Answer 1

http://gyazo.com/ec3fc2f6f6e397c50c8ea0990317b72e.png
I thought you can't have integral limits from high to low?

Answer 2

tht makes no sense
idont get math

Answer 3

i thought tht too aha ;p

Answer 4

why would you think that?

Answer 5

\[\int_{a}^{b}f(x)~dt=F(b)-F(a)\]
there is no restriction on b or a

if F(b) = F(a), then the value is 0
if F(b) > F(a), the the value is positive
if F(b) < F(a), the the value is negative