### Home > CALC > Chapter 1 > Lesson 1.4.1 > Problem 1-138

1-138.

If a function is even, it is symmetric about the *y*-axis.

If a function is odd, it also has 180º rotational symmetry about the origin.

Because of the symmetry of the areas, *A*(*f*, −3 ≤ *x* ≤ 3) = 0.

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