[DTube] Deriving the Product to Sum Formulas

masterwu (59)in #steemstem • 8 years ago (edited)

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The product to sum formulas are another subset of trigonometric identities.

In this video, we take the sum-difference formulas from:

...to derive the four product to sum formulas:

And from these results, we also derive the half-angle (aka power reducing) formulas:

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8 years ago in #steemstem by masterwu (59)

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fabio2614 (67) 8 years ago

wow! I'll be learning this, but just bits for my junior class ..thanks masterwu...you're such a blessing

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masterwu (59) 8 years ago

My pleasure @fabio2614. Good luck with your studies!

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