OpenStax, Algebra and Trigonometry 2e §9.5 Solving Trigonometric Equations · Exercise 172 · Trigonometry · Identities

Solving Trigonometric Equations · Exercise 172

Find all exact solutions to the equation on $[0, 2 π) .$

Rewrite the expression as a product instead of a sum: $cos (2 x) + cos (- 8 x) .$

~8 minWritten answer · compare with the solution

OpenStax, Algebra and Trigonometry 2e · §9.5 Solving Trigonometric Equations · Exercise 172

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