Hi,

Can someone please explain to me what is happening from step A to step B in the attached diagram of a Full-Wave rectified Waveform ??

Ok, he's applying the limits, but from where did he get the "-1"s?

Attached is also my working for those steps.

Any help would be appreciated.

Reference link: Full-Wave Rectified Waveform Help for Fourier Series, Computer Science, Homework Help - Transtutors.com