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Product/sum identities
Posted:
Mar 4, 1998 1:09 AM


Here's an offthewall 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((xy)/2) etc ) to our Precalc students? I notice for example this isn't in the DemanaWaits Precalc but is in the Prentice Hall Ryan et al Advanced Math.
Elizabeth Blandford Westridge School, Pasadena



