yes it is - you have
sum_0^x 1
so the upper bound of sum depends on x, and as such should be taken in the account when appliyng differential on x
Type: Posts; User: vart
yes it is - you have
sum_0^x 1
so the upper bound of sum depends on x, and as such should be taken in the account when appliyng differential on x
you forgot to d/dx of the (x times) part
sqrt(-1) = +i
and
sqrt(-1) = -i
as well
When you get to this step:
you get to the complex numbers - talking about complex numbers - you have 2 possibilities for the expression instead of one
you choose the wrong one to preserve the...