byronleecollins13 byronleecollins13

27-02-2022
Mathematics

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Rewrite the product as a sum or difference.
sin(-x) sin(9x)

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zsm2800 zsm2800

27-02-2022

Answer:

[cos(10x) - cos(8x)]/2

Step-by-step explanation:

sin(-x) sin(9x) = {cos[9x - (-x)] - cos(9x + (-x)]}/2

= [cos(10x) - cos(8x)]/2

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