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Home > PC > Chapter 8 > Lesson 8.1.1 > Problem 8-17

8-17.

Solve: sin4x − cos4x = Homework Help ✎

Factor.

Substitute using the Fundamental Pythagorean Identity.

Substitute using the Fundamental Pythagorean Identity.

Combine.

Divide both sides by −2.

Square root both sides. Don't forget the ±.