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15.7.

Special identities 7.

Sum of two cubes:

Difference of two cubes:

Sum of two cubes:

Difference of two cubes:

Brief Detailed

Easy

1.
2.
3.
4.
5.
6.

Medium

7.
8.
9.
10.

Hard

11.
12.
13.
14.

Extreme

15.
16.
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