# sinc

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• Mar 13th 2011, 05:50 AM
mathcore
sinc
given sinc(x) = sin(x)/x

show that sinc(x) = cos(x/2)sinc(x/2)

please help
• Mar 13th 2011, 06:01 AM
islam
reply
hello dear
use the identity $sinx=2sin(x/2)cos(x/2)$
• Mar 13th 2011, 06:18 AM
mathcore
thank you that makes it so much understandable. i was looking for an identity to bring in cos i got stuck trying to use cos(x-pi/2) but knew that was overcomplicating thing

i dont know why i didnt know that identity but thats all i really needd to figure it out thanks