Trigonometry: Product to Sum & Sum to Product Formulas

Описание: This video goes through 3 examples using the Product to Sum Formulas and the Sum to Product Formulas. The examples are all very basic examples showing a direct substitution into the formula and then simplifying.


MISTAKE: The formula is written incorrectly in the second example. However, the problem has been worked correctly, by using the correct values for the formula that should have been used. IT SHOULD SAY SIN 30, WHICH IS 1/2

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