What is meant by odd or even multiple of pi/2 ?
When you multiply pi/2 with any odd integer then its odd multiple of pi/2, and when you multiply an even integer to pi/2 then its called even multiple of pi/2
Simple...
When you multiply pi/2 with any odd integer then its odd multiple of pi/2, and when you multiply an even integer to pi/2 then its called even multiple of pi/2
Simple...