3.6 Product-to-Sum and Sum-to- Product Formulas Warm-up (IN) 1.Find the exact value of: Learning Objective: To be able to properly identify which product-to-sum.

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3.6 Product-to-Sum and Sum-to- Product Formulas Warm-up (IN) 1.Find the exact value of: Learning Objective: To be able to properly identify which product-to-sum formula is appropriate to solve a problem and to understand and develop methods regarding how to properly simplify trigonometric expressions.

NOTES And the formulas are…. Product- to-Sum You need to KNOW these!!

Sum-to- Product

Ex 1 – Express the following products as sums with sines and cosines

Ex 2 – Express each sum or difference as a product with sines and cosines

HW – pg. 267 #1-5,11-14,19,20,24,27 Out – Explain in words what we did in Ex 1-a. Summary – This lesson is… Don’t forget about POW!!