Expand `(sqrt(c)-1)^6`

`(sqrt(c) - 1)^2*(sqrt(c) - 1)^2 *(sqrt(c) - 1)^2`

`(sqrt(c) - 1)^2 = c - 2csqrt(c) + 1`

From 2nd step replace to have:

`(c - 2csqrt(c) + 1) (c - 2csqrt(c) + 1) (c - 2csqrt(c) + 1)`

**Use distributive property to get:**

`c^3 - 6c^2sqrt(c) + 15c^2 - 20csqrt(c) + 14c - 6sqrt(c) + c + 1`

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