Back to 9.5 Solving Trigonometric Equations

9.5 Exercise 212

Avg difficulty 2.5

Prove the identity.

Two frequencies of sound are played on an instrument governed by the equation $n \left(t\right) = 8 \cos \left(20 \pi t\right) \cos \left(1000 \pi t\right) .$ What are the period and frequency of the “fast” and “slow” oscillations? What is the amplitude?

OpenStax Algebra and Trigonometry 2e, 9.5 Solving Trigonometric Equations, exercise 212

AI Tutor

Adapted from College Algebra © 2021 Rice University. Licensed under CC BY 4.0. Sources: College Algebra 2e, Algebra and Trigonometry 2e, Precalculus 2e, College Algebra with Corequisite Support 2e. Imported at revision 4922e46.