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5.27.4  Cardinal sine function : sinc

The sinc command takes an expression x as its only argument and returns the value of sinc function at x , defined by

sinc(x)=






sin(x)
x
,
x≠ 0,
1,x=0.

For example, input :

sinc(pi*x)

Output :

sin(pi*x)/(pi*x)

Input :

sinc(0)

Output :

1

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