SOLUTION: Write the sum as a product using a sum-to-product identity. sin (-α) + sin (19α) Select one: a. 2 cos (-2α)sin(-10α) b. 2 sin (-2α)cos(-10α) c.

SOLUTION: Write the sum as a product using a sum-to-product identity. sin (-α) + sin (19α) Select one: a. 2 cos (-2α)sin(-10α) b. 2 sin (-2α)cos(-10α) c.

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Question 1093833: Write the sum as a product using a sum-to-product identity.
sin (-α) + sin (19α)
Select one:
a. 2 cos (-2α)sin(-10α)
b. 2 sin (-2α)cos(-10α)
c. 2 sin (-2α)sin(-10α)
d. 2 sin (9α)cos(-10α)
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
See "Half angle formulas" on Wikipedia.

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