Product-to-sum and sum-to-product formulae
Trigonometric ratios and identities · Mathematics
Study notes
Q: Express as a product: sin 5x + sin 3x. Express as a sum: 2cos 4x cos 2x. sin 5x + sin 3x = 2sin(4x)cos(x). 2cos4xcos2x = cos6x + cos2x.
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Trigonometric ratios and identities · Mathematics
Q: Express as a product: sin 5x + sin 3x. Express as a sum: 2cos 4x cos 2x. sin 5x + sin 3x = 2sin(4x)cos(x). 2cos4xcos2x = cos6x + cos2x.