# The Cardinal Sine Evaluation - Part 2

Calculus Level 4

$\large \displaystyle \int _{ 0 }^{ \frac { \pi }{ 2 } }{ f\left( x \right) f\left( \frac { \pi }{ 2 } -x \right) } \, dx$

In mathematics the cardinal sine function or $$\text{sinc}(x)$$ is defined as $$f(x) = \frac {\sin(x)}x$$.

Which of these answer choices represent the value of above expression?

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