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Topic: Product/sum identities
Replies: 5   Last Post: Mar 4, 1998 8:58 PM

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Elizabeth Blandford

Posts: 17
Registered: 12/6/04
Product/sum identities
Posted: Mar 4, 1998 1:09 AM
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Here's an off-the-wall question for you folk. Do we still need to
introduce the old sum to product trig identities (sin x + sin y = 2 sin
((x+y)/2)cos((x-y)/2) etc ) to our Precalc students? I notice for example
this isn't in the Demana-Waits Precalc but is in the Prentice Hall Ryan et
al Advanced Math.

Elizabeth Blandford
Westridge School,

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