Would you be able to check my working out of Bn & An for increased time range

3t+3, -2<t<0

t+3, 0<t<2

6t-2, 2<t<6

I get for An

n= 1 (-16/pi^2)

=2 0

=3 (-16/9pi^2)

=4 0

=5 (-16/15pi^2)

=6 0

This look correct for me, the Bn doesn't look right to me

Bn

n=1 8(6+1/pi)

=2 48-(4/pi)

=3 48+(8/3pi)

=4 48-(2/pi)

=5 48+(8/5pi)

=6 48-(4/3pi)

you home version of wolfram alpha is something i must get, typing it into the free online one is a pain in the bum.

regards