Trigonometry: Product Identities (DTube)

in #dtube • 7 years ago (edited)
7 years ago in #dtube by
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     7 years ago 

    I don't always prove trig identities but when it's usually the product identities ;)

    View Video Notes on Steemit: https://steemit.com/mathematics/@mes/trigonometry-product-identities

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