Mathematics, 03.05.2021 22:10, tchloe448

Use the sum-to-product or product-to-sum to solve or simplify as far as possible. 1.) cos (α − β) − cos (α + β)
2.) sin (x + y) sin (x − y)

this is due today - help is appreciated!

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Use the sum-to-product or product-to-sum to solve or simplify as far as possible. 1.) cos (α − β)...