Back to 9.4 Sum-to-Product and Product-to-Sum Formulas

9.4 Exercise 51

Avg difficulty 2.5

Rewrite the sum as a product of two functions or the product as a sum of two functions. Give your answer in terms of sines and cosines. Then evaluate the final answer numerically, rounded to four decimal places.

$\cos \left(58°\right) + \cos \left(12°\right)$

OpenStax Algebra and Trigonometry 2e, 9.4 Sum-to-Product and Product-to-Sum Formulas, exercise 51

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.