public void testSinc() {
BivariateFunction div = new Divide();
UnivariateFunction sin = new Sin();
UnivariateFunction id = new Identity();
UnivariateFunction sinc1 = FunctionUtils.combine(div, sin, id);
UnivariateFunction sinc2 = new Sinc();
for (int i = 0; i < 10; i++) {
double x = FastMath.random();
Assert.assertEquals(sinc1.value(x), sinc2.value(x), EPS);
}
}