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## Homework Statement

integrate cos ^3(πx-1)

## Homework Equations

1-sin^2(πx-1) = cos ^2 (πx-1)

## The Attempt at a Solution

(1-sin^2(πx-1))cos(πx-1)

Let u = πx-1

1/ πdu = dx

1-sin^2(u )cos (u)

1/ π(X-1/3sin^3(u)

Basically I'm Confused on how to get past the trig identity part.